FL928 – Misrouted Battery Cable May Cause Electrical Short – 2019-2023 Thomas Built Bus HDX School Buses

SEOCONTENT-START

Defect / Noncompliance Information Report (Section 573.6) FL928 Date of Submission: May 23, 2022 Manufacturer: Daimler Truck North America LLC P.O. BOX 3849 Portland, Oregon 97208 Type of Report: x Safety Defect ⃝ Non-Compliance Vehicle Information Model Yr. Start: 2019 Model Yr. End: 2023 Make: Thomas Built School Buses Model: HDX Production Dates: Begin: 03/08/2018 End: 03/24/2022 Descriptive Information: On certain Thomas Built Bus HDX model school buses, the battery cables may potentially chafe on the transmission oil cooler hoses. NOTE:  Identify by body style or type. – HDX  If bus, include the number of passengers. 1-90 Basis for Determination of the Recall Population: At the current time, all HDX buses built from March 08, 2018 to March 24, 2022 are included in the recall population. However, as DTNA continues to investigate, the population may be decreased. Number potentially involved: 2943 Estimated percentage of involved with defect: 1% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: Certain HDX school buses had the positive battery cable routed in a manner that permitted those battery cables to rub on the transmission oil cooler hoses, creating the possibility of an electrical fault or, in the extreme, a thermal event. Describe the safety risk: If the battery cable rubs on the hose long enough, there is a potential that after prolonged contact the hose could wear thru the electrical conduit, creating the risk of an electrical short or, in the extreme, a fire. Identify any warning which can precede or occur: DTNA reasonably expects this potential chafe should be detected during regular maintenance intervals. The maintenance manual specifically states to inspect the battery cables for chafing every 4,000 miles (6,400 Km) or 60 days. Because chafing must continue for a prolonged time and would show visible signs of chafing before electrical cables wear to the point of a safety risk, DTNA reasonably believes there would be many opportunities for detection and repair before the issue would rise to the safety risk described above occurring. If applicable, identify the manufacture of the defective or noncompliant component.: Hellermann Tyton Involved Components Component Name: CLAMP-CABLE,NYLON,AWG 0000 Component Description: Battery Cable Clamp Component Part Number: DK 016 0020 Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: In mid-February of 2022, DTNA received a report from the field of a potential thermal event on a three-year-old HDX school bus; according to the best of DTNA’s knowledge, no injuries or deaths occurred in this event. DTNA immediately began an investigation into the issue. No additional field reports or warranty claims of fire or similar symptoms were found. In early March of 2022, as soon as reasonably practicable to investigate the vehicle, DTNA’s Cause and Origin investigator examined the suspect bus and determined the origin of the thermal event was likely at the battery cable crossing over the transmission cooler hoses. Within that same month and lasting into April, DTNA began a comprehensive review of warranty data and field reports. Upon reviewing information more closely for this defect, DTNA found 17 total warranty claims ranging from November of 2018 to December of 2020 for the battery cables rubbing or contacting the transmission oil cooler hoses. None of these claims indicated any evidence of a fire or similar thermal event. Nonetheless, in April 2022, out of an abundance of caution DTNA decided to conduct a voluntary recall on certain Thomas Built Bus HDX chassis. There are no injuries or deaths reported. In early May of 2022, in an effort to reduce the administrative burdens and to simply the reporting requirements, DTNA decided to merge recalls FL928 (22V271 – School Bus) and FL929 (22V272 Non School Bus). There are, materially speaking, no differences in the recalls except for the vocations of the population. To further clarify, the newly merged recall population will be designated as FL928A (22V271) for school bus vocations and FL928B (22V272) will be designated for commercial bus vocations. In addition, per a request from the Agency, a more concise description was added to the Involved Components section of the DIR filing. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. Inspection and repair of the cable routings, if required, will be performed by Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. Identify the Recall Schedule Describe the recall schedule for notifications.: Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Begin Date: 6/20/2022 Planned Dealer Notification End Date: 6/20/2022 Planned Owner Notification Begin Date: 6/20/2022 Planned Owner Notification End Date: 6/20/2022 Does DTNA plan to file inconsequentiality petition? ⃝ Yes x No Manufacturer’s identification code for this recall (if applicable): FL928 DTNA Representative; Tiffani Torgeson Manager, Compliance and Regulatory Affairs

**************************************************************************************************************

Defect / Noncompliance Information Report (Section 573.6) FL928 Date of Submission: April 22, 2022 Manufacturer: Daimler Truck North America LLC P.O. BOX 3849 Portland, Oregon 97208 Type of Report: x Safety Defect ⃝ Non-Compliance Vehicle Information Model Yr. Start: 2019 Model Yr. End: 2023 Make: Thomas Built Buses Model: HDX Production Dates: Begin: 03/19/2018 End: 03/24/2022 Descriptive Information: On certain Thomas Built Bus HDX model school busses, the battery cables may potentially chafe on the transmission oil cooler hoses. NOTE:  Identify by body style or type. – HDX  If bus, include the number of passengers. 1-90 Basis for Determination of the Recall Population: At the current time, all HDX school busses built from March 20, 2018 to March 25, 2022 are included in the recall population. However, as DTNA continues to investigate, the population may be decreased. Number potentially involved: 2943 Estimated percentage of involved with defect: 1% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: Certain HDX buses had the positive battery cable routed in a manner that permitted those battery cables to rub on the transmission oil cooler hoses, creating the possibility of an electrical fault or, in the extreme, a thermal event. Describe the safety risk: If the battery cable rubs on the hose long enough, there is a potential that after prolonged contact the hose could wear thru the electrical conduit, creating the risk of an electrical short or, in the extreme, a fire. Identify any warning which can precede or occur: DTNA reasonably expects this potential chafe should be detected during regular maintenance intervals. The maintenance manual specifically states to inspect the battery cables for chafing every 4,000 miles (6,400 Km) or 60 days. Because chafing must continue for a prolonged time and would show visible signs of chafing before electrical cables wear to the point of a safety risk, DTNA reasonably believes there would be many opportunities for detection and repair before the issue would rise to the safety risk described above occurring. If applicable, identify the manufacture of the defective or noncompliant component.: No components – DTNA assembly issue. Involved Components Component Name: N/A Component Description: N/A Component Part Number: N/A Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: In mid-February of 2022, DTNA received a report from the field of a potential thermal event on a three-year-old HDX school bus; according to the best of DTNA’s knowledge, no injuries or deaths occurred in this event. DTNA immediately began an investigation into the issue. No additional field reports or warranty claims of fire or similar symptoms were found. In early March of 2022, as soon as reasonably practicable to investigate the vehicle, DTNA’s Cause and Origin investigator examined the suspect bus and determined the origin of the thermal event was likely at the battery cable crossing over the transmission cooler hoses. Within that same month and lasting into April, DTNA began a comprehensive review of warranty data and field reports. Upon reviewing information more closely for this defect, DTNA found 17 total warranty claims ranging from November of 2018 to December of 2020 for the battery cables rubbing or contacting the transmission oil cooler hoses. None of these claims indicated any evidence of a fire or similar thermal event. Nonetheless, in April 2022, out of an abundance of caution DTNA decided to conduct a voluntary recall on certain Thomas Built Bus HDX chassis. There are no injuries or deaths reported. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. Inspection and repair of the cable routings, if required, will be performed by Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. Identify the Recall Schedule Describe the recall schedule for notifications.: Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Begin Date: 6/20/2022 Planned Dealer Notification End Date: 6/20/2022 Planned Owner Notification Begin Date: 6/20/2022 Planned Owner Notification End Date: 6/20/2022 Does DTNA plan to file inconsequentiality petition? ⃝ Yes x No Manufacturer’s identification code for this recall (if applicable): FL928 DTNA Representative; Tiffani Torgeson Manager, Compliance and Regulatory Affairs

**************************************************************************************************************

Daimler Trucks North America LLC IMPORTANT SAFETY RECALL See enclosed VIN list June 2022 FL928A Interim Recall Notice NHTSA #22V-271 School Bus #22V-272 Non-School Bus Subject: TBB HDX Battery Cables This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Trucks North America LLC (DTNA), on behalf of its wholly owned subsidiaries, Freightliner Custom Chassis Corporation and Thomas Built Buses, has decided that a defect which relates to motor vehicle safety exists on specific Model Year 2019-2023 HDX model buses manufactured March 8, 2018, through March 24, 2022. On certain HDX model buses, the battery cables may rub on the transmission oil cooler hoses, which can cause an electrical short circuit, increasing the risk of a fire. This is the first of two notices you will receive regarding this subject. This letter is to inform you of an upcoming Recall to correct the issue noted above. DTNA is currently validating the repair and securing replacement parts. In the interim, please continue performing pre-trip inspections as instructed in your vehicle’s driver and maintenance manuals. The second notice will inform you when the final remedy is available. When you receive the second notice, please contact your authorized DTNA dealer to schedule the Recall for your vehicle. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address DTNA.Warranty.Campaigns@Daimlertruck.com. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you are not able to have the defect remedied without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Trucks North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone

**************************************************************************************************************

P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone 503.745.9009 Fax January 2023 Daimler Truck North America LLC NorthAmericaLLC DaimlerTruck IMPORTANT SAFETY RECALL This notice applies to your vehicle(s), see enclosed VIN list. . FL928 AB NHTSA #22V-271 (School Bus) Subject: TBB HDX Battery Cables #22V-272 (Non-School Bus) Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses (TBB), has decided that a defect which relates to motor vehicle safety exists in certain TBB model years 2019-2023, HDX model schoo l buses, manufactured March 8, 2018, through March 24, 2022. Please contact an authorized Daimler Truck North America dealer to arrange to have the Recall performed and to ensure that parts are available at the dealership. The Recall will take approximately one hour and will be performed at no charge to you. To locate an authorized dealer, search online at northamerica.daimlertruck.com/contact-us/. Scroll down to “Locate a Dealer,” and select the appropriate brand. You may also confirm your vehicle’s involvement in this recall online at dtna-dlrinfo.prd.freightliner.com:48518/VinLookup/vin-module/getVinLookupPage. You may be liable for any progressive damage that results from your failure to complete the Recall within a reasonable time after receiving notification. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department in the postage-paid envelope with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have paid to have this recall condition corrected prior to this notice, you may be eligible to receive reimbursement. Please see the reverse side of this notice for details. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7 a.m. to 4 p.m. Pacific Time, Monday-Friday, e-mail address dtna.warranty.campaigns@daimlertruck.com. If you are not able to have the defect remedied without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE., Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to www.nhtsa.gov. On certain TBB HDX model buses, the battery cables may chafe on the transmission oil cooler hoses, which can cause an electrical short circuit, increasing the risk of a fire. The battery cable routing will be repaired to prevent contact with the transmission oil cooler hoses. Repairs will be performed by Daimler Truck North America authorized service facilities. Reimbursement to Customers for Repairs Performed Prior to Recall P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone 503.745.9009 Fax Daimler Truck North America LLC NorthAmericaLLC DaimlerTruck If you have already paid to have this recall condition corrected you may be eligible to receive reimbursement. Requests for reimbursement may include parts and labor. Reimbursement may be limited to the amount the repair would have cost if completed by an authorized Daimler Truck North America LLC dealer. The following documentation must be presented to your dealer for consideration for reimbursement. Please provide original or clear copies of all receipts, invoices, and repair orders that show: • The name and address of the person who paid for the repair. • The Vehicle Identification Number (VIN) of the vehicle that was repaired. • What problem occurred, what repair was done, when the repair was done. • Who repaired the vehicle. • The total cost of the repair expense that is being claimed. • Proof of payment for the repair (such as the front and back of a cancelled check or a credit card receipt). Reimbursement will be made by check from your Daimler Trucks North America LLC dealer. Please speak with your Daimler Truck North America LLC authorized dealer concerning this matter.

**************************************************************************************************************

Subject: TBB HDX Battery Cables Models Affected: Specific model year 2019-2023 Thomas Built Buses (TBB) HDX model buses, manufactured March 8, 2018, through March 24, 2022. General Information Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses (TBB), has decided that a defect that relates to motor vehicle safety exists on the vehicles mentioned above. On certain TBB HDX model buses, the battery cables may chafe on the transmission oil cooler hoses, which can cause an electrical short circuit, increasing the risk of a fire. The battery cable routing will be repaired to prevent contact with the transmission oil cooler hoses. There are approximately 3,107 vehicles involved in this campaign. Additional Repairs Dealers must complete all outstanding Recall and Field Service campaigns prior to the sale or delivery of a vehicle. A Dealer will be liable for any progressive damage that results from its failure to complete campaigns before sale or delivery of a vehicle. Owners may be liable for any progressive damage that results from failure to complete campaigns within a reasonable time after receiving notification. Work Instructions Please refer to the attached work instructions. Replacement Parts Replacement parts are now available and can be obtained by ordering the part number(s) listed below from your facing Parts Distribution Center. If our records show your dealership has ordered any vehicle(s) involved in campaign number FL928, a list of the customers and vehicle identification numbers will be available on the DTNA Portal. Please refer to this list when ordering parts for this recall. Table 1 – Replacement Parts for FL928 Table 1 Removed Parts U.S. and Canadian Dealers, please follow Warranty Failed Parts Tracking shipping instructions for the disposition of all removed parts. Export distributors, please destroy removed parts unless otherwise advised. Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) Page 1 Campaign Number Part Number Part Description Qty. per VIN FL928 AB TYC DCT110HIR TIE STRAP 14 23-12886-001 MOUNT-DUAL SWIVEL SADDLE SZ4 6 23-13476-000 CLAMP-CA TIE 4.13X15IN 0.5W 14 DK 016 0020 4/0 BATTERY CABLE CL 2 Campaign Number Procedure Time Allowed (hours) SRT Code Corrective Action FL928 AB Reroute battery cables and trans cooler lines 0.5 996-R164A 12-Repair Recall/Campaign Table 2 Claims for Credit You will be reimbursed for your parts, labor, and handling (landed cost for Export Distributors) by submitting your claim through the Warranty system within 30 days of completing this campaign. Please reference the following information in OWL: • Claim type is Recall Campaign. • In the Campaign field, enter the campaign number and appropriate condition code (FL928-A, FL928-B, etc.). • In the Primary Failed Part Number field, enter 25-FL928-000. • In the Parts field, enter the appropriate part number(s) as shown in the Replacement Parts Table. • In the Labor field, enter the appropriate SRT from the Labor Allowance Table. • The VMRS Component Code is F99-999-005 and the Cause Code is A1 – Campaign. • U.S. and Canada — Reimbursement for Prior Repairs. When a customer asks about reimbursement, please do the following: • Accept the documentation of the previous repair. • Make a brief check of the customer’s paperwork to see if the repair may be eligible for reimbursement. (See the “Copy of Owner Letter” section of this bulletin for reimbursement guidelines.) • Submit an OWL Recall Pre-Approval Request for a decision. • Include the approved amount on your claim in the Other Charges section. • Attach the documentation to the pre-approval request. • If approved, submit a based on claim for the pre-approval. • Reimburse the customer the appropriate amount. IMPORTANT: OWL must be viewed prior to performing the recall to ensure the vehicle is involved and the campaign has not been previously completed. U.S. and Canadian dealers, contact the Warranty Campaigns Department via a WSC (Wty Support Ctr) ticket on the DTNA Portal, if you have any questions or need additional information. Export distributors, submit a Web inquiry or contact your International Service Manager. U.S. and Canadian Dealers: To return excess kit inventory related to this campaign, U.S. dealers must submit a Parts Authorization Return (PAR) to the Memphis PDC. Canadian dealers must submit a PAR to their facing PDC. All kits must be in resalable condition. PAR requests must include the original purchase invoice number. Export Distributors: Excess inventory is not returnable. The letter notifying U.S. and Canadian vehicle owners is included for your reference. Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) Labor Allowance Table 2 – Labor Allowance Page 2 Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) Please note that the National Traffic and Motor Vehicle Safety Act, as amended (Title 49, United States Code, Chapter 301), requires the owner’s vehicle(s) be corrected within a reasonable time after parts are available to you. The Act states that failure to repair a vehicle within 60 days after tender for repair shall be prima facie evidence of an unreasonable time. However, circumstances of a particular situation may reduce the 60 day period. Failure to repair a vehicle within a reasonable time can result in either the obligation to (a) replace the vehicle with an identical or reasonably equivalent vehicle, without charge, or (b) refund the purchase price in full, less a reasonable allowance for depreciation. The Act further prohibits dealers from selling a vehicle unless all outstanding recalls are performed. Any lessor is required to send a copy of the recall notification to the lessee within 10 days. Any subsequent stage manufacturer is required to forward this notice to its distributors and retail outlets within five working days. Page 3 Copy of Notice to Owners Subject: TBB HDX Battery Cables Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) For the Notice to U.S. Customers: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. For the Notice to Canadian Customers: This notice is sent to you in accordance with the requirements of the Motor Vehicle Safety Act. This is to inform you that your vehicle may contain a defect that could affect the safety of a person. Daimler Truck North America LLC (DTNA), on behalf of its wholly owned subsidiary, Thomas Built Buses (TBB), has decided that a defect which relates to motor vehicle safety exists in certain TBB model years 2019-2023, HDX model school and commercial buses, manufactured March 8, 2018, through March 24, 2022. On certain TBB HDX model school and commercial buses, the battery cables may chafe on the transmission oil cooler hoses, which can cause an electrical short circuit, increasing the risk of a fire. The battery cable routing will be repaired to prevent contact with the transmission oil cooler hoses. Repairs will be performed by Daimler Truck North America authorized service facilities. Please contact an authorized Daimler Truck North America dealer to arrange to have the Recall performed and to ensure that parts are available at the dealership. The Recall will take approximately one hour and will be performed at no charge to you. To locate an authorized dealer, search online at northamerica.daimlertruck.com/contact-us/. Scroll down to “Locate a Dealer,” and select the appropriate brand. You may also confirm your vehicle’s involvement in this recall online at dtna-dlrinfo.prd.freightliner.com:48518/VinLookup/vin-module/getVinLookupPage. You may be liable for any progressive damage that results from your failure to complete the Recall within a reasonable time after receiving notification. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department in the postage-paid envelope with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have paid to have this recall condition corrected prior to this notice, you may be eligible to receive reimbursement. Please see the reverse side of this notice for details. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address dtna.warranty.campaigns@daimlertruck.com. For the Notice to U.S. Customers: If you are not able to have the defect remedied without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE., Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. For the Notice to Canadian Customers: If you wish to submit a complaint about this recall, you can contact Transport Canada road safety, 80 rue Noel, Gatineau, Quebec J8Z 0A1 or call (800) 333-0510. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Page 4 Reimbursement to Customers for Repairs Performed Prior to Recall If you have already paid to have this recall condition corrected you may be eligible to receive reimbursement. Requests for reimbursement may include parts and labor. Reimbursement may be limited to the amount the repair would have cost if completed by an authorized Daimler Truck North America LLC dealer. The following documentation must be presented to your dealer for consideration for reimbursement. Please provide original or clear copies of all receipts, invoices, and repair orders that show: • The name and address of the person who paid for the repair • The Vehicle Identification Number (VIN) of the vehicle that was repaired • What problem occurred, what repair was done, when the repair was done • Who repaired the vehicle • The total cost of the repair expense that is being claimed • Proof of payment for the repair (such as the front and back of a cancelled check or a credit card receipt) Reimbursement will be made by check from your Daimler Truck North America LLC dealer. Please speak with your Daimler Truck North America LLC authorized dealer concerning this matter. Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) Page 5 Work Instructions Subject: TBB HDX Battery Cables Models Affected: Specific model year 2019-2023 Thomas Built Buses (TBB) HDX model buses, manufactured March 8, 2018, through March 24, 2022. Routing & Clipping of Power Cables & Transmission Cooler Hoses NOTE: The affected population for this recall includes vehicles with both Cummins and Detroit Diesel engines, integrated with Allison 2000-series and 3000-series transmissions. The work instructions are predominantly identical for all, unless mentioned otherwise. 1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires. NOTE: The main power disconnect switch (MPDS) is located in the battery box compartment. 2. Turn the MPDS to the OFF position. 3. Disconnect the negative battery cables at the batteries. 4. Open the engine compartment door. WARNING Do not use bottle jacks to raise the vehicle. Always use floor jacks. Bottle jacks can slip, allowing the vehicle to fall, which could result in damage to the axle, serious injury, or death. 5. Raise the vehicle, and support it with appropriate jack stands. Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) Page 6 NOTE: Excessive movement of cables and hoses can lead to unwanted cable chaffing due to the vibration. 7. Inspect the power cables and the transmission cooler hoses for excessive movement. 8. Perform a pull-push test to check the amount of movement available to cables. Grip the cables firmly and check for excessive movement, if any. 9. If required, secure the cables with the help of cable ties. For instructions regarding routing and clipping of the cables, see Thomas Built Buses Service Bulletin 00-008 – Routing and Clipping Tips for Extending School Bus Life. 12/12/2022 f261568 Fig. 1, Blemishes on the Power Cables and the Cooler Hoses 12/12/2022 f261569 Fig. 2, Blemishes on the Power Cables and the Cooler Hoses Daimler Truck North America LLC Recall Campaign Page 7 6. Inspect for any blemishes caused due to interference (rubbing) between the power cables and the transmission cooler hoses. See Fig. 1 and Fig. 2. January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) NOTE: The transmission cooler hoses and the power cables are located under the rear of the vehicle. 12/12/2022 f261570 A A. Inspect the cables and transmission cooler hoses in the indicated region, and clip those with cable ties if required. Fig. 3, Ideal Positioning of the Cables, Clamps, and Hoses Daimler Truck North America LLC Recall Campaign Page 8 January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) 10. Figure 3 and Figure 4 show the ideal positioning of the power cables, clamps, and transmission cooler hoses. 12/12/2022 f261571 1 2 1 3 4 3 1. Dual Tie Strap 2. Clamp Fastening Bolt 3. DK Clamp 4. L-Bracket Fig. 4, Clipping the Cables and Hoses Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) Page 9 12/12/2022 f261572 2 1 3 4 1. Clamp 2. Transmission Cooler Hoses 3. Mounting Fastener 4. Mounting Bracket Fig. 5, Transmission Cooler Hose Clamp Removal Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) Page 10 11. For vehicles equipped with an Allision 3000-series transmission: If so equipped, remove and discard the clamp securing the transmission cooler hoses, shown in Fig. 5, by removing the mounting fastener. Daimler Truck North America LLC Recall Campaign Page 11 12. If necessary, loosen the transmission cooler hose fittings at the transmission, then position the hoses to maintain clearance between the hose and the hose fitting as shown in Fig. 6. 12/12/2022 f261573 A B 2 1 10° 0° Allision 3000-series transmission shown: A. Rotate the fitting counterclockwise 10 degrees. B. Align the hose fitting at zero degree to ensure sufficient clearance. 1. Hose Fitting 2. Transmission Cooler Hose Fig. 6, Maintaining Clearance between the Hose and the Hose Fitting January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) NOTE: Removing the clamp allows the adjustment of the transmission cooler hoses as instructed in step 12. (Allision 3000-series transmission shown) 13. For vehicles equipped with an Allison 2000-series transmission: Route and secure the cooler hoses as shown in Fig. 7. 14. If necessary, loosen the transmission cooler hose fittings, and rotate the hoses slightly to ensure zero contact between the power cables and the cooler hoses. 15. Connect the negative battery cables at the batteries. 16. Turn the MPDS to the ON position. 17. Start the engine to verify the repair. 12/12/2022 f261574 1 2 3 Detroit Diesel engine integrated with an Allison 2000-series transmission shown. 1. Hose Fittings 2. Dual Tie Straps 3. Transmission Cooler Hoses Fig. 7, Securing the Transmission Cooler Hoses Daimler Truck North America LLC Recall Campaign January 2023 FL928 AB NHTSA #22V-271 (School Bus) NHTSA #22V-272 (Non-School Bus) Transport Canada #2022-207 (School Bus) Transport Canada #2022-208 (Non-School Bus) Page 12 (Detroit Diesel engine integrated with an Allison 2000-series transmission shown)

**************************************************************************************************************

The information contained in this letter supercedes and supplements any related policies and procedures in any previously released bulletins, the Warranty Manual, and/or previously released letters. Failure to read or distribute this letter will not exempt addressees from compliance with the information contained herein. Internal Daimler Truck North America LLC REF #: ICI22-025 Effective: 06/20/22 Release: 06/20/22 SUBJECT: FL928 – Interim Recall Notice This letter is to inform you that an interim recall notice is being sent to affected customers for recall FL928~ TBB HDX Battery Cables. The interim notices were mailed on 06/20/2022. A copy (with French translation) follows for your reference. This notice is for your information only. There is no action for dealers to take. If customers inquire, please refer them to the interim notice. If you have questions or need further information, contact the Warranty Campaigns Department by submitting an inquiry through the WSC link on DTNAConnect. OBJET : FL928 – Avis de rappel provisoire Cette lettre a pour but de vous informer qu’un avis de rappel provisoire est envoyé aux clients concernés pour le rappel FL928 ~ Câbles de batterie TBB HDX. Les avis intermédiaires seront postés avant le 06/20/2022. Une copie (avec traduction française) suit pour votre référence. Cet avis est pour votre information seulement. Il n’y a aucune action à prendre par les revendeurs. Si les clients se renseignent, veuillez les référer à l’avis intermédiaire. Si vous avez des questions ou avez besoin de plus amples informations, contactez le service des campagnes de garantie en soumettant une demande via le lien WSC sur DTNAConnect. WARRANTY CAMPAIGNS DEPARTMENT P.O. Box 4090 800-547-0712 Portland, Oregon 97208-4090 ATTENTION: Dealer Principal, Warranty Manager, Service Manager, Parts Manager Freightliner Dealers – U.S. and Canada Western Star and Sterling Dealers – U.S. and Canada FCCC Dealers – U.S. and Canada Thomas Built Buses Dealers – U.S. and Canada Direct Warranty Customers – U.S. and Canada Detroit Diesel Distributors Export Distributors If you have questions about this Letter, please submit your inquiry on the Web using the WSC Link on DTNAConnect Daimler Trucks North America LLC IMPORTANT SAFETY RECALL See enclosed VIN list June 2022 FL928A Interim Recall Notice NHTSA #22V-271 School Bus #22V-272 Non-School Bus Subject: TBB HDX Battery Cables This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Trucks North America LLC (DTNA), on behalf of its wholly owned subsidiaries, Freightliner Custom Chassis Corporation and Thomas Built Buses, has decided that a defect which relates to motor vehicle safety exists on specific Model Year 2019-2023 HDX model buses manufactured March 8, 2018, through March 24, 2022. On certain HDX model buses, the battery cables may rub on the transmission oil cooler hoses, which can cause an electrical short circuit, increasing the risk of a fire. This is the first of two notices you will receive regarding this subject. This letter is to inform you of an upcoming Recall to correct the issue noted above. DTNA is currently validating the repair and securing replacement parts. In the interim, please continue performing pre-trip inspections as instructed in your vehicle’s driver and maintenance manuals. The second notice will inform you when the final remedy is available. When you receive the second notice, please contact your authorized DTNA dealer to schedule the Recall for your vehicle. If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address DTNA.Warranty.Campaigns@Daimlertruck.com. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you are not able to have the defect remedied without charge and within a reasonable time, you may wish to submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue SE, Washington, DC 20590; or call the Vehicle Safety Hotline at (888) 327-4236 (TTY: 800-424-9153); or go to http://www.nhtsa.gov. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Trucks North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone Daimler Trucks North America LLC June 2022 FL928A Interim Recall Notice Transport Canada #2022-207 Non-School Bus #2022-208 School Bus Subject: TBB HDX Battery Cables This notice is sent to you in accordance with the requirements of the Motor Vehicle Safety Act. This is to inform you that your vehicle may contain a defect that could affect the safety of a person. Daimler Trucks North America LLC (DTNA), on behalf of its wholly owned subsidiaries, Freightliner Custom Chassis Corporation and Thomas Built Buses, has decided that a defect which relates to motor vehicle safety exists on specific Model Year 2019-2023 HDX model buses manufactured March 8, 2018, through March 24, 2022. On certain HDX model buses, the battery cables may rub on the transmission oil cooler hoses, which can cause an electrical short circuit, increasing the risk of a fire. This is the first of two notices you will receive regarding this subject. This letter is to inform you of an upcoming Recall to correct the issue noted above. DTNA is currently validating the repair and securing replacement parts. In the interim, please continue performing pre-trip inspections as instructed in your vehicle’s driver and maintenance manuals. The second notice will inform you when the final remedy is available. When you receive the second notice, please contact your authorized DTNA dealer to schedule the Recall for your vehicle If you do not own the vehicle that corresponds to the identification number(s) which appears on the Recall Notification, please return the notification to the Warranty Campaigns Department with any information you can furnish that will assist us in locating the present owner. If you have leased this vehicle, Federal law requires that you forward this notice to the lessee within 10 days. If you are a subsequent stage manufacturer, Federal law requires that you forward this notice to your distributors and retail outlets within five working days. If you have questions about this Recall, please contact the Warranty Campaigns Department at (800) 547-0712, 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday, e-mail address DTNA.Warranty.Campaigns@Daimlertruck.com. For other concerns, you may contact the Customer Assistance Center at (800) 385-4357. If you have a safety concern relating to this Recall, you may wish to contact Transport Canada – Motor Vehicle Safety at, 80 rue Noel, Gatineau, Quebec J8Z 0A1 or phone (800) 333-0510. We regret any inconvenience this action may cause but feel certain you understand our interest in motor vehicle safety. WARRANTY CAMPAIGNS DEPARTMENT Enclosure Daimler Trucks North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone Daimler Trucks North America LLC Juin 2022 FL928A Avis de rappel provisoire Transports Canada #2022-207 Autobus non scolaire #2022-208 Autobus scolaire Objet: Câbles de batterie TBB HDX Cet avis vous est envoyé conformément aux exigences de la Loi sur la sécurité automobile. La présente vise à vous informer que votre véhicule peut contenir une défectuosité qui pourrait nuire à la sécurité d’une personne. Daimler Trucks North America LLC (DTNA), au nom de ses filiales à part entière, Freightliner Custom Chassis Corporation et Thomas Built Buses, a décidé qu’il existe une défectuosité liée à la sécurité des véhicules automobiles sur les autobus scolaires modèles et les véhicules construits pour l’année de modèle 2019-2023 HDX Du 8 mars 2018 au 24 mars 2022. Sur certains autobus modèles HDX, les câbles de batterie peuvent se frotter sur les tuyaux du refroidisseur d’huile de transmission, ce qui peut causer un court-circuit électrique et augmenter le risque d’incendie. Il s’agit du premier des deux avis que vous recevrez à ce sujet. La présente a pour but de vous informer d’un rappel à venir afin de corriger le problème susmentionné. DTNA est en train de valider la réparation et l’arrimage des pièces de rechange. Entre-temps, veuillez continuer d’effectuer des inspections avant le voyage conformément aux directives du conducteur et des manuels d’entretien de votre véhicule. Le deuxième avis vous informera lorsque la réparation finale sera disponible. Lorsque vous recevez le deuxième avis, veuillez communiquer avec votre concessionnaire DTNA autorisé pour planifier le rappel de votre véhicule. Si vous ne possédez pas le véhicule qui correspond au (x) numéro (s) d’identification qui apparaît sur la Notification de rappel, veuillez retourner la notification aux campagnes de garantie Service avec toute information que vous pouvez fournir qui nous aidera à localiser le présent le propriétaire. Si vous avez loué ce véhicule, la loi fédérale exige que vous transmettiez le présent avis à le locataire dans un délai de 10 jours. Si vous êtes un fabricant subséquent, la loi fédérale exige que vous transmettiez ce avis à vos distributeurs et points de vente au détail dans un délai de cinq jours ouvrables. Si vous avez des questions sur ce rappel, veuillez communiquer avec la Département des campagnes de garantie au (800) 547-0712, de 7 h à 16 h 00 p.m. Pacific Time, Monday à Friday, adresse courriel DTNA.Warranty.Campaigns@Daimlertruck.com. Pour toute autre question, vous pouvez communiquer avec le Centre d’assistance à la clientèle au (800) 385-4357. Si vous avez des préoccupations en matière de sécurité relativement à ce rappel, vous pouvez communiquer avec Transports Canada ‒ Sécurité des véhicules automobiles au 80, rue Noel, Gatineau (Québec) J8Z 0A1 ou par téléphone au (800) 333-0510. Nous regrettons tout inconvénient que cette mesure pourrait causer, mais nous estimons que vous comprenez notre intérêt pour la sécurité des véhicules automobiles. Département des campagnes de garantie Enceinte Daimler Trucks North America LLC Service des campagnes de garantie Case postale 4090 Portland (OR) 97208-4090 8005470712 Téléphone

**************************************************************************************************************

OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-271 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : APR 22, 2022 NHTSA Recall No. : 22V-271 Manufacturer Recall No. : FL928 Manufacturer Information : Manufacturer Name : Daimler Trucks North America, LLC Address : 4747 N. Channel Avenue Portland OR 97217-3849 Company phone : 800-745-8000 Population : Number of potentially involved : 2,943 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2019-2023 Thomas Built Bus HDX Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : Thomas Built School Bus Production Dates : MAR 19, 2018 – MAR 25, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Certain HDX buses had the positive battery cable routed in a manner that permitted those battery cables to rub on the transmission oil cooler hoses, creating the possibility of an electrical fault or, in the extreme, a thermal event. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the battery cable rubs on the hose long enough, there is a potential that after prolonged contact the hose could wear thru the electrical conduit, creating the risk of an electrical short or, in the extreme, a fire. Description of the Cause : NR Identification of Any Warning that can Occur : DTNA reasonably expects this potential chafe should be detected during regular maintenance intervals. The maintenance manual specifically states to inspect the battery cables for chafing every 4,000 miles (6,400 Km) or 60 days. Because chafing must continue for a prolonged time and would show visible signs of chafing before electrical cables wear to the point of a safety risk, DTNA reasonably believes there would be many opportunities for detection and repair before the issue would rise to the safety risk described above occurring. Part 573 Safety Recall Report 22V-271 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : n/a Component Description : n/a Component Part Number : n/a Supplier Identification : Component Manufacturer Name : NR Address : NR NR Country : NR Chronology : In mid-February of 2022, DTNA received a report from the field of a potential thermal event on a three-yearold HDX school bus; according to the best of DTNA’s knowledge, no injuries or deaths occurred in this event. DTNA immediately began an investigation into the issue. No additional field reports or warranty claims of fire or similar symptoms were found. In early March of 2022, as soon as reasonably practicable to investigate the vehicle, DTNA’s Cause and Origin investigator examined the suspect bus and determined the origin of the thermal event was likely at the battery cable crossing over the transmission cooler hoses. Within that same month and lasting into April, DTNA began a comprehensive review of warranty data and field reports. Upon reviewing information more closely for this defect, DTNA found 17 total warranty claims ranging from November of 2018 to December of 2020 for the battery cables rubbing or contacting the transmission oil cooler hoses. None of these claims indicated any evidence of a fire or similar thermal event. Nonetheless, in April 2022, out of an abundance of caution DTNA decided to conduct a voluntary recall on certain Thomas Built Bus HDX chassis. There are no injuries or deaths reported. Description of Remedy : Description of Remedy Program : Inspection and repair of the cable routings, if required, will be performed by Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. Part 573 Safety Recall Report 22V-271 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Date : JUN 20, 2022 – JUN 20, 2022 Planned Owner Notification Date : JUN 20, 2022 – JUN 20, 2022 * NR – Not Reported

**************************************************************************************************************

OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-271 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : MAY 23, 2022 NHTSA Recall No. : 22V-271 Manufacturer Recall No. : FL928 Manufacturer Information : Manufacturer Name : Daimler Trucks North America, LLC Address : 4747 N. Channel Avenue Portland OR 97217-3849 Company phone : 800-745-8000 Population : Number of potentially involved : 2,943 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2019-2023 Thomas Built School Bus HDX Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : Thomas Built School Bus Production Dates : MAR 08, 2018 – MAR 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Certain HDX school buses had the positive battery cable routed in a manner that permitted those battery cables to rub on the transmission oil cooler hoses, creating the possibility of an electrical fault or, in the extreme, a thermal event. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the battery cable rubs on the hose long enough, there is a potential that after prolonged contact the hose could wear thru the electrical conduit, creating the risk of an electrical short or, in the extreme, a fire. Description of the Cause : NR Identification of Any Warning that can Occur : DTNA reasonably expects this potential chafe should be detected during regular maintenance intervals. The maintenance manual specifically states to inspect the battery cables for chafing every 4,000 miles (6,400 Km) or 60 days. Because chafing must continue for a prolonged time and would show visible signs of chafing before electrical cables wear to the point of a safety risk, DTNA reasonably believes there would be many opportunities for detection and repair before the issue would rise to the safety risk described above occurring. Part 573 Safety Recall Report 22V-271 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : CLAMP-CABLE,NYLON,AWG 0000 Component Description : Battery Power Cable Component Part Number : DK 016 0020 Supplier Identification : Component Manufacturer Name : Hellerman Tyton Address : NR NR Country : NR Chronology : In mid-February of 2022, DTNA received a report from the field of a potential thermal event on a three-yearold HDX school bus; according to the best of DTNA’s knowledge, no injuries or deaths occurred in this event. DTNA immediately began an investigation into the issue. No additional field reports or warranty claims of fire or similar symptoms were found. In early March of 2022, as soon as reasonably practicable to investigate the vehicle, DTNA’s Cause and Origin investigator examined the suspect bus and determined the origin of the thermal event was likely at the battery cable crossing over the transmission cooler hoses. Within that same month and lasting into April, DTNA began a comprehensive review of warranty data and field reports. Upon reviewing information more closely for this defect, DTNA found 17 total warranty claims ranging from November of 2018 to December of 2020 for the battery cables rubbing or contacting the transmission oil cooler hoses. None of these claims indicated any evidence of a fire or similar thermal event. Nonetheless, in April 2022, out of an abundance of caution DTNA decided to conduct a voluntary recall on certain Thomas Built Bus HDX chassis. There are no injuries or deaths reported. In early May of 2022, in an effort to reduce the administrative burdens and to simply the reporting requirements, DTNA decided to merge recalls FL928 (22V271 – School Bus) and FL929 (22V272 Non School Bus). There are, materially speaking, no differences in the recalls except for the vocations of the population. To further clarify, the newly merged recall population will be designated as FL928A (22V271) for school bus vocations and FL928B (22V272) will be designated for commercial bus vocations. In addition, per a request from the Agency, a more concise description was added to the Involved Components section of the DIR filing. Part 573 Safety Recall Report 22V-271 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Inspection and repair of the cable routings, if required, will be performed by Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Date : JUN 20, 2022 – JUN 20, 2022 Planned Owner Notification Date : JUN 20, 2022 – JUN 20, 2022 * NR – Not Reported

**************************************************************************************************************

OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-271 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : JUN 10, 2022 NHTSA Recall No. : 22V-271 Manufacturer Recall No. : FL928 Manufacturer Information : Manufacturer Name : Daimler Trucks North America, LLC Address : 4747 N. Channel Avenue Portland OR 97217-3849 Company phone : 800-745-8000 Population : Number of potentially involved : 2,943 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2019-2023 Thomas Built School Bus HDX Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : Thomas Built School Bus Production Dates : MAR 08, 2018 – MAR 24, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Certain HDX school buses had the positive battery cable routed in a manner that permitted those battery cables to rub on the transmission oil cooler hoses, creating the possibility of an electrical fault or, in the extreme, a thermal event. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the battery cable rubs on the hose long enough, there is a potential that after prolonged contact the hose could wear thru the electrical conduit, creating the risk of an electrical short or, in the extreme, a fire. Description of the Cause : NR Identification of Any Warning that can Occur : DTNA reasonably expects this potential chafe should be detected during regular maintenance intervals. The maintenance manual specifically states to inspect the battery cables for chafing every 4,000 miles (6,400 Km) or 60 days. Because chafing must continue for a prolonged time and would show visible signs of chafing before electrical cables wear to the point of a safety risk, DTNA reasonably believes there would be many opportunities for detection and repair before the issue would rise to the safety risk described above occurring. Part 573 Safety Recall Report 22V-271 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : CLAMP-CABLE,NYLON,AWG 0000 Component Description : Battery Power Cable Component Part Number : DK 016 0020 Supplier Identification : Component Manufacturer Name : Facil Flexaloy Address : 3000F Crosspoint Lane Charlotte North Carolina 28201 Country : United States Chronology : In mid-February of 2022, DTNA received a report from the field of a potential thermal event on a three-yearold HDX school bus; according to the best of DTNA’s knowledge, no injuries or deaths occurred in this event. DTNA immediately began an investigation into the issue. No additional field reports or warranty claims of fire or similar symptoms were found. In early March of 2022, as soon as reasonably practicable to investigate the vehicle, DTNA’s Cause and Origin investigator examined the suspect bus and determined the origin of the thermal event was likely at the battery cable crossing over the transmission cooler hoses. Within that same month and lasting into April, DTNA began a comprehensive review of warranty data and field reports. Upon reviewing information more closely for this defect, DTNA found 17 total warranty claims ranging from November of 2018 to December of 2020 for the battery cables rubbing or contacting the transmission oil cooler hoses. None of these claims indicated any evidence of a fire or similar thermal event. Nonetheless, in April 2022, out of an abundance of caution DTNA decided to conduct a voluntary recall on certain Thomas Built Bus HDX chassis. There are no injuries or deaths reported. In early May of 2022, in an effort to reduce the administrative burdens and to simply the reporting requirements, DTNA decided to merge recalls FL928 (22V271 – School Bus) and FL929 (22V272 Non School Bus). There are, materially speaking, no differences in the recalls except for the vocations of the population. To further clarify, the newly merged recall population will be designated as FL928A (22V271) for school bus vocations and FL928B (22V272) will be designated for commercial bus vocations. In addition, per a request from the Agency, a more concise description was added to the Involved Components section of the DIR filing. Part 573 Safety Recall Report 22V-271 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Inspection and repair of the cable routings, if required, will be performed by Daimler Truck North America authorized service facilities. Daimler Truck North America shall be offering a refund for owner-paid repairs covered by this recall if the repair was performed prior to the date indicated in the reimbursement plan, which will be posted with owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Date : JUN 20, 2022 – JUN 20, 2022 Planned Owner Notification Date : JUN 20, 2022 – JUN 20, 2022 * NR – Not Reported

SEOCONTENT-END