2015-2018 Thomas Built Minotour School Buses FL903 Solenoid Connector to CNG Fuel Tank May Corrode

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Defect Information Report (Section 573.6) FL-903 Date of Submission: October 23, 2021 Manufacturer: Daimler Trucks North America LLC P.O. BOX 3849 Portland, Oregon 97208 Type of Report: X Safety Defect ⃝ Non-Compliance Vehicle Information Model Yr. Start: 2015 Model Yr. End: 2018 Make: Thomas Built Buses Model: Minotour Production Dates: Begin: 12/14/2013 End: 06/29/2017 Descriptive Information: Certain CNG Minotour buses built within date range above. Number potentially involved: 87 Estimated percentage of involve with defect: 10% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: Per the component supplier, IMPCO Automotive: “The underbody shut-off solenoid connector to a CNG fuel tank may corrode and could form a high-resistance short in the connector, potentially causing overheating or, in rare circumstances, a self -extinguishing flame. If there is a fuel leak or other combustible material in the vicinity, there is a risk of ignition.” Describe the safety risk: Per IMPCO Automotive: “If there is a fuel leak or other combustible material in the vicinity, there is a risk of ignition.” Identify any warning which can precede or occur: If applicable, identify the manufacture of the defective or noncompliant component. : IMPCO Automotive Involved Components Component Name: Shut-Off Solenoid Component Description: CNG Fuel Shut-Off Solenoid Component Part Number: Unknown Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision.: IMPCO Automotive designed and installed CNG conversions for gasoline powered General Motors vehicles and other vehicle makes including chassis used in the Minotour bus. IMPCO Automotive no longer operates as a company. In February 2021 Thomas Built Buses received a report on a Minotour bus with an IMPCO Automotive CNG fuel system installed. The bus was preparing to leave the yard when the engine shutdown. The driver went to get a technician from the shop and when they returned, there was smoke coming from under the bus. In mid March of 2021, an investigation by the customer and Thomas Built Buses of the bus identified the CNG fuel shut-off solenoid as the source of the event. At this time, Thomas Built Buses identified an IMPCO Automotive/General Motors recall, 13V-225, that affected vehicles built prior to the bus involved in this incident and may have related to the reported Minotour issue. DTNA began an investigation to better determine if the event was related to the previous IMPCO Automotive recall. In or about that time, DTNA reviewed the fuel shut-off solenoid from the bus involved in the incident. The solenoid did not have any identifying part numbers printed on it so it could not be determined if it was the solenoid that was previously recalled. In the course of this investigation DTNA discovered that that some of IMPCO Automotive’s assets were purchased by another company. DTNA reached out to this company to see if they had any production records or knowledge related to the Thomas Built Buses that IMPCO Automotive had converted to CNG. The new company was unable to provide any records to help determine if the bus contained the same defect that IMPCO had previously recalled. In September 2021, out of an abundance of caution, DTNA decided to issue a voluntary safety recall on certain Thomas Built Buses Minotour school buses with an IMPCO Automotive CNG fuel system in order to replace that supplier’s defective parts. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. The CNG fuel cut-off solenoid will be replaced. Repairs will be performed by Daimler Trucks North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. 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: 11/14/2021 Planned Dealer Notification End Date: 11/14/2021 Planned Owner Notification Begin Date: 11/14/2021 Planned Owner Notification End Date: 11/14/2021 Manufacture’s identification code for this recall (if applicable): FL-903 DTNA Representative; Larissa Stoffels Executive Manager, Vehicle Safety Compliance and Regulatory Affairs

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Defect Information Report (Section 573.6) FL-903 Date of Submission: October 23, 2021 Manufacturer: Daimler Trucks North America LLC P.O. BOX 3849 Portland, Oregon 97208 Type of Report: X Safety Defect ⃝ Non-Compliance Vehicle Information Model Yr. Start: 2015 Model Yr. End: 2018 Make: Thomas Built Buses Model: Minotour Production Dates: Begin: 12/14/2013 End: 06/29/2017 Descriptive Information: Certain CNG Minotour buses built within date range above. Number potentially involved: 87 Estimated percentage of involve with defect: 10% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: Per the component supplier, IMPCO Automotive: “The underbody shut-off solenoid connector to a CNG fuel tank may corrode and could form a high-resistance short in the connector, potentially causing overheating or, in rare circumstances, a self-extinguishing flame. If there is a fuel leak or other combustible material in the vicinity, there is a risk of ignition.” Describe the safety risk: Per IMPCO Automotive: If there is a fuel leak or other combustible material in the vicinity, there is a risk of a fire. Identify any warning which can precede or occur: If applicable, identify the manufacture of the defective or noncompliant component.: IMPCO Automotive Involved Components Component Name: Shut-Off Solenoid Component Description: CNG Fuel Shut-Off Solenoid Component Part Number: Unknown Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision.: IMPCO Automotive designed and installed CNG conversions for gasoline powered General Motors vehicles and other vehicle makes including chassis used in the Minotour bus. IMPCO Automotive no longer operates as a company. In February 2021 Thomas Built Buses received a report on a Minotour bus with an IMPCO Automotive CNG fuel system installed. The bus was preparing to leave the yard when the engine shutdown. The driver went to get a technician from the shop and when they returned, there was smoke coming from under the bus. In mid March of 2021, an investigation by the customer and Thomas Built Buses of the bus identified the CNG fuel shut-off solenoid as the source of the event. At this time, Thomas Built Buses identified an IMPCO Automotive/General Motors recall, 13V-225, that affected vehicles built prior to the bus involved in this incident and may have related to the reported Minotour issue. DTNA began an investigation to better determine if the event was related to the previous IMPCO Automotive recall. In or about that time, DTNA reviewed the fuel shut-off solenoid from the bus involved in the incident. The solenoid did not have any identifying part numbers printed on it so it could not be determined if it was the solenoid that was previously recalled. In the course of this investigation DTNA discovered that that some of IMPCO Automotive’s assets were purchased by another company. DTNA reached out to this company to see if they had any production records or knowledge related to the Thomas Built Buses that IMPCO Automotive had converted to CNG. The new company was unable to provide any records to help determine if the bus contained the same defect that IMPCO had previously recalled. In September 2021, out of an abundance of caution, DTNA decided to issue a voluntary safety recall on certain Thomas Built Buses Minotour school buses with an IMPCO Automotive CNG fuel system in order to replace that supplier’s defective parts. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. The CNG fuel cut-off solenoid will be replaced. Repairs will be performed by Daimler Trucks North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. 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: 11/14/2021 Planned Dealer Notification End Date: 11/14/2021 Planned Owner Notification Begin Date: 11/14/2021 Planned Owner Notification End Date: 11/14/2021 Manufacture’s identification code for this recall (if applicable): FL-903 DTNA Representative; Larissa Stoffels Executive Manager, Vehicle Safety Compliance and Regulatory Affairs

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Daimler Trucks North America LLC November 2021 FL903 Interim Recall Notice NHTSA #21V-741 IMPORTANT SAFETY RECALL See enclosed VIN list Subject: TBB Minotour CNG Solenoid 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 subsidiary, Thomas Built Buses (TBB), has decided that a defect, which relates to motor vehicle safety exists on specific Model Year 2015-2018 TBB Minotour school buses built on a General Motors (GM) chassis and manufactured December 14, 2013, through June 29, 2017, and equipped with an IMPCO Automotive designed and installed Compressed Natural Gas (CNG) conversion. On certain vehicles, the underbody shut-off solenoid connector to a CNG fuel tank may corrode and could form a high-resistance short in the connector, potentially causing overheating or, in rare circumstances, as self-extinguishing flame. If there is a fuel leak or other combustible material in the vicinity, there is a risk of 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. TBB is currently securing replacement parts. There is no action for you to take at this time. The second notice will inform you when the final remedy is available. When you receive the second notice, please contact your authorized TBB 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@Daimler.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 https://www.safercar.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

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Daimler Trucks North America LLC January 2022 FL903A NHTSA #21V-741 IMPORTANT SAFETY RECALL See enclosed VIN list Subject: TBB Minotour CNG Solenoid This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. Daimler Trucks 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 on specific Model Year 2015-2018 TBB Minotour school buses built on a General Motors (GM) chassis and manufactured December 14, 2013, through June 29, 2017, and equipped with an IMPCO Automotive Compressed Natural Gas (CNG) conversion. On certain vehicles, the underbody shutoff solenoid connector to a CNG fuel tank may corrode and could form a high-resistance short in the connector, potentially causing overheating or, in rare circumstances, a self-extinguishing flame. If there is a fuel leak or other combustible material in the vicinity, there is a risk of fire. The CNG fuel shutoff solenoid will be replaced. Repairs will be performed by Daimler Trucks North America authorized service facilities. Please contact an authorized Daimler Trucks North America dealer to arrange to have the Recall performed and to ensure that parts are available at the dealership. To locate an authorized dealer, go to www.Daimler-TrucksNorthAmerica.com. On the menu tab, select “Contact,” scroll down to “Find a Dealer,” and select the appropriate brand. The Recall will take approximately four hours and will be performed at no charge to you. You may also confirm your vehicle’s involvement in this recall at this URL: https://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 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. 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 to https://www.safercar.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 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 Trucks 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 Trucks North America LLC authorized dealer concerning this matter Daimler Trucks North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone

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Daimler Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 1 Subject: TBB Minotour CNG Solenoid Models Affected: Specific model years 2015-2018 Thomas Built Buses Minotour school buses built on a General Motors (GM) chassis and manufactured December 14, 2013, through June 29, 2017, and equipped with an IMPCO Automotive Compressed Natural Gas (CNG) conversion.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 vehicles, the underbody shutoff solenoid connector to a CNG fuel tank may corrode and could form a high-resistance short in the connector, potentially causing overheating or, in rare circumstances, a self-extinguishing flame. If there is a fuel leak or other combustible material in the vicinity, there is a risk of fire. The CNG fuel shutoff solenoid will be replaced. There are approximately 90 vehicles involved. 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. Please contact Warranty Campaigns for consideration of additional charges prior to performing the repair. Work Instructions Please refer to the attached work instructions. Replacement Parts Installation kits for the CNG fuel shutoff solenoid have been sent directly to the specific dealers who will install them on the affected buses. If you have not been contacted by TBB, then your location will not be performing this recall. 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. Labor Allowance Table 1 – Labor Allowance Campaign Number Procedure Time Allowed (hours) SRT Codes Corrective Action FL903A Replace CNG fuel shutoff solenoid 4.2 996-R134A 12-Repair Recall/Campaign Table 1 Daimler Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 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 (FL903-A). • In the Primary Failed Part field, enter 25-FL903-000. • Do not enter anything in the parts section, dealers will be provided kits from TBB. • In the Labor section, 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. Also, check for a completion sticker prior to beginning work. U.S. and Canadian dealers, contact the Warranty Campaigns Department via Web inquiry at DTNAConnect.com/WSC, 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 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. Daimler Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 3 Copy of Notice to Owners Subject: TBB Minotour CNG Solenoid This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. 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 on specific model years 2015-2018 TBB Minotour school buses built on a General Motors (GM) chassis and manufactured December 14, 2013, through June 29, 2017, and equipped with an IMPCO Automotive Compressed Natural Gas (CNG) conversion. On certain vehicles, the underbody shutoff solenoid connector to a CNG fuel tank may corrode and could form a high-resistance short in the connector, potentially causing overheating or, in rare circumstances, a self-extinguishing flame. If there is a fuel leak or other combustible material in the vicinity, there is a risk of fire. The CNG fuel shutoff solenoid will be replaced. 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. To locate an authorized dealer, go to www.Daimler-TrucksNorthAmerica.com. On the menu tab, select “Contact,” scroll down to “Find a Dealer,” and select the appropriate brand. The Recall will take approximately four hours and will be performed at no charge to you. You may also confirm your vehicle’s involvement in this recall at this URL: https://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 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. 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 to https://www.safercar.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 Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 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 Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 5 Work Instructions Subject: TBB Minotour CNG Solenoid Models Affected: Specific model year 2015-2018 Thomas Built Buses Minotour school buses built on a General Motors (GM) chassis and manufactured December 14, 2013, through June 29, 2017, and equipped with an IMPCO Automotive Compressed Natural Gas (CNG) conversion. CNG Fuel Shutoff Solenoid Replacement 1. Park the vehicle on a level surface, turn engine OFF, place in park, chock tires, and turn the body circuit breaker to the OFF position. 2. Disconnect negative battery cables at the batteries. Fuse replacement 3. Remove the under hood electrical center cover (fuse center). See Fig. 1. 4. Locate the 30-AMP fuel pump fuse and remove it from the under hood electrical center. 5. Discard the 30-AMP fuse. Fig. 1, Electrical Center in Engine Compartment Daimler Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 6 6. Replace the fuse with the appropriate fuse as follows: • If vehicle has three CNG tanks, then replace with a 5 AMP fuse. • If vehicle has four CNG tanks, then replace with a 7.5 AMP fuse. 7. Reinstall the under hood electrical center cover. Remove the Midship and the Aft Axle Tank Shield 8. Lift the vehicle and support it. 9. Using a 17 mm socket, 16 mm socket and a #3 Phillips bit. Remove the eight bolts holding the driver’s side, and sixteen screws holding the passenger side midship tank shields in place; then remove shields. See Fig. 3. 10. Using a 16 mm socket, remove the twelve bolts securing the AFT axle tank shield; then remove shield. See Fig. 2. Fig. 3, Midship Shield Bolts Location Fig. 2, Aft-Tanks, Shield Not Shown Daimler Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 7 Midship Tank Repair Work. 11. Close the main shutoff valve for the midship tanks. See Fig. 4. 12. Disconnect the high-pressure lockoff (HPL) solenoid electrical connector, and cut the zip tie holding it to the HPL solenoid. NOTICE Due to HPL solenoid supply issues, some of these new parts have blue and brown wires, and others have red and black wires. 13. Cut the harness and replace the connector making sure to splice the matching wire colors (blue-to-blue, and brown-to-brown) shown in Fig. 5, or red-to-blue, and black-to-brown referenced in Fig. 6. To minimize water intrusion, use a moisture resistant type of splice that is equal to IP67 protection. 14. Put a mark on the valve to indicate the orientation of solenoid to ensure proper installation of the new solenoid. 15. Remove the 7/8” HPL solenoid coil retaining nut. 16. Remove the HPL solenoid coil and discard it. Fig. 4, Main Shutoff Valve One Per Tank Fig. 5, New Connector Shown With Blue and Brown Wires Fig. 6, New Connector Shown With Red and Black Wires Daimler Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 8 17. Remove the old HPL seal, and install a new one, then apply lubrication to the new seal. 18. Remove the old seal of the HPL solenoid-retaining nut. Apply lubrication to the new seal, then install. 19. Using the reference mark from step 14, install the new HPL solenoid coil. 20. Install the HPL solenoid coil-retaining nut. Tighten the retaining nut to 6.5 NM (57.5 lbf·in). 21. Apply dielectric grease on the electrical connector and reinstall it. 22. Zip tie the harness back up making sure there is no strain on the harness. See Fig. 7. AFT Axle Tank Repair Work 23. Close the manual shutoff valve. 24. Disconnect the HPL solenoid electrical harness and cut the zip tie holding it to the solenoid. 25. Replace the HPL electrical harness with the harness provided. 26. Mark the correct orientation of the solenoid on the valve using this mark to ensure the correct installation of the new solenoid. 27. Remove the HPL solenoid coil-retaining nut. 28. Remove the HPL solenoid coil and discard. Fig. 7, When Securing the Harness and Connector, Allow for Strain Relief Daimler Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 9 29. With solenoid removed, inspect the stem for any dirt or debris. See Fig. 8. 30. Remove and replace the HPL solenoid coil seal and apply lubrication. 31. Remove and replace the HPL solenoid coil retaining nut seal and apply lubrication. See Fig. 9. 32. Install the new HPL solenoid coil and retaining nut. Tighten to 6.5 NM (57.5 lbf·in). 33. Apply dielectric grease on the electrical connector and reinstall it. 34. Install a new zip tie making sure the harness wiring has strain relief at the connector. CNG Fuel System Check 35. Lower the vehicle. 36. Connect the negative battery cable, and turn the body circuit breaker ON. 37. Start the engine. 38. Raise and support the vehicle. 39. Verify operation of the solenoid by performing a magnetic function test on the CNG HPL solenoid. 40. With the engine running, place a paper clip or equivalent on the HPL retaining nut. 41. Determine if the HPL solenoid-retaining nut is magnetic. If it is magnetic, it is working properly. 42. Lower the vehicle. Fig. 8, Solenoid Removed Mount Location Fig. 9, Solenoid Assembled View, Mounting Nut Daimler Truck Recall Campaign North America LLC January 2022 FL903A NHTSA #21V-741 Page 10 43. Turn engine off. 44. Raise vehicle and support. 45. Install the midship tank shield and bolts. 46. Install the AFT axle tank shield and bolts. 47. Lower vehicle, and return to service.

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