2021-2022 Thomas Built Buses Saf-T-Liner C2, Saf-T-Liner EFX, & Saf-T-Liner HDX School Buses FL884 Steering Arm and Tie Rod Bolts May Fracture

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Defect Information Report (Section 573.6) FL-884 Date of Submission: April 12, 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: 2021 Model Yr. End: 2022 Make: Thomas Built Buses Model: Saf-T-Liner HDX , Saf-T-Liner C2, Safe-T-Liner EFX School Buses Production Dates: Begin: 01/12/2021 End: 04/06/2021 Descriptive Information: Vehicles built with certain suspect tie rod arm bolts (N308676020022) and steering arm bolts (N308676020025). Number potentially involved: 1,738 Estimated percentage of involve with defect: 2% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: Suspect bolts used to assemble Detroit front axle assemblies have a lengthwise “seam” defect potentially leading to bolt failure. Describe the safety risk: Single bolt fracture may lead to decrease in steering response and both bolts failing would lead to complete loss of steering/directional control of the vehicle. Identify any warning which can precede or occur: Decrease in steering response If applicable, identify the manufacture of the defective or noncompliant component: Company Name: Cold Heading Company Country: USA Address 1: 21777 Hoover Rd Address 2: City: Warren State: MI Zip/Postal Code: 48089 First Name: Ginger Last Name: Anderson Position: Manager of Corporate Quality Email: ganderson@coldheading.com Phone: 586.497.7000 x6222 Involved Components Component Name: Steering Arm Bolt, Tie Rod Bolt Component Description: Component Part Number: N308676020025, N308676020022 Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: Late February, 2021, despite having no warranty claims nor other indications of failures on customer vehicles, DTNA axle assembly plant reported tie rod bolt and steering arm bolt quality concerns and began containment. Quality alert was issued for axle assembly plant locations. Early March, 2021 DTNA defined suspect bolt lots and cleared inventory. Suspect bolts were sent to supplier for additional analysis. Late March, 2021, DTNA received initial metallurgical report for supplier showing potential for long term fatigue failure. Discussions with supplier ongoing. Early April 2021, even though DTNA is not aware of any field failures related to this concern, DTNA decided to conduct a voluntary safety recall while continuing to investigate the population. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement: Tie rod arm bolts and steering arm bolts 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: 06/10/2021 Planned Dealer Notification End Date: 06/10/2021 Planned Owner Notification Begin Date: 06/10/2021 Planned Owner Notification End Date: 06/10/2021 Manufacture’s identification code for this recall (if applicable): FL-884 DTNA Representative; Larissa Stoffels Executive Manager, Vehicle Safety Compliance and Regulatory Affairs

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Amended Defect Information Report (Section 573.6) FL-884 Date of Submission: June 15, 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: 2021 Model Yr. End: 2022 Make: Thomas Built Buses Model: Saf-T-Liner HDX , Saf-T-Liner C2, Safe-T-Liner EFX School Buses Production Dates: Begin: 01/12/2021 End: 04/06/2021 Descriptive Information: Vehicles built with certain suspect tie rod arm bolts (N308676020022) and steering arm bolts (N308676020025). Number potentially involved: 1,738 Estimated percentage of involve with defect: 2% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: Suspect bolts used to assemble Detroit front axle assemblies have a lengthwise “seam” defect potentially leading to bolt failure. Describe the safety risk: Single bolt fracture may lead to decrease in steering response and both bolts failing would lead to complete loss of steering/directional control of the vehicle increasing the risk of a crash. Identify any warning which can precede or occur: Decrease in steering response If applicable, identify the manufacture of the defective or noncompliant component: Company Name: Cold Heading Company Country: USA Address 1: 21777 Hoover Rd Address 2: City: Warren State: MI Zip/Postal Code: 48089 First Name: Ginger Last Name: Anderson Position: Manager of Corporate Quality Email: ganderson@coldheading.com Phone: 586.497.7000 x6222 Involved Components Component Name: Steering Arm Bolt, Tie Rod Bolt Component Description: Component Part Number: N308676020025, N308676020022 Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: Late February, 2021, despite having no warranty claims nor other indications of failures on customer vehicles, DTNA axle assembly plant reported tie rod bolt and steering arm bolt quality concerns and began containment. Quality alert was issued for axle assembly plant locations. Early March, 2021 DTNA defined suspect bolt lots and cleared inventory. Suspect bolts were sent to supplier for additional analysis. Late March, 2021, DTNA received initial metallurgical report for supplier showing potential for long term fatigue failure. Discussions with supplier ongoing. Early April 2021, even though DTNA is not aware of any field failures related to this concern, DTNA decided to conduct a voluntary safety recall while continuing to investigate the population. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement: Tie rod arm bolts and steering arm bolts 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: 06/10/2021 Planned Dealer Notification End Date: 06/10/2021 Planned Owner Notification Begin Date: 06/10/2021 Planned Owner Notification End Date: 06/10/2021 Manufacture’s identification code for this recall (if applicable): FL-884 DTNA Representative; Larissa Stoffels Executive Manager, Vehicle Safety Compliance and Regulatory Affairs

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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. Page 1 of 1 Daimler Trucks North America LLC REF #: ICI21-017 Effective: 06/22/2021 Release: 06/22/2021 SUBJECT: DDC D21R6 (FL884) – Campaign Suspended This letter is to inform you that Detroit Diesel Recall Campaign D21R6 (FL884), DETROITTM Tie Rod & Steer Arm Bolt Replacement will be suspended on Tuesday, 6/22/2021. On that date you will see D21R6 marked as “Suspended” in OWL.Due to parts availability it has been determined that this campaign will be suspended. A second Important Campaign Information letter will be posted when the campaign has been reactivated. Last Repair Date for D21R6 (FL884) Repairs: Tuesday, 6/22/2021If you have questions or need further information, contact the Warranty Campaigns Department by submitting an inquiry through the WSC Link on 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 Direct Warranty Customers – U.S. and Canada Export Distributors Detroit Diesel Distributors If you have questions about this Letter, please submit your inquiry on the Web using the WSC Link on DTNAConnect 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. Page 1 of 1 Daimler Trucks North America LLC REF #: ICI21-017 Effective: 06/22/2021 Release: 06/22/2021 SUBJECT: DDC D21R6 (FL884) – Campaign Suspended Cette lettre vise à vous informer que la campagne de rappel de Detroit Diesel D21R6 (FL884), detroittm tie rod & steer arm bolt remplacement sera suspendue le mardi 6/22/2021. À cette date, vous verrez D21R6 marqué comme « Suspendu » dans OWL.En raison de la disponibilité des pièces, il a été déterminé que cette campagne sera suspendue. Une deuxième lettre d’information importante sur la campagne sera affichée lorsque la campagne aura été réactivée. Date de la dernière réparation pour D21R6 (FL884) Réparations: mardi, 22/6/2021 Si vous avez des questions ou avez besoin de plus amples renseignements, communiquez avec le Service des campagnes de garantie en soumettant une demande par l’entremise du 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 Direct Warranty Customers – U.S. and Canada Export Distributors Detroit Diesel Distributors If you have questions about this Letter, please submit your inquiry on the Web using the WSC Link on DTNAConnect

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Amended Defect Information Report (Section 573.6) FL-884 Date of Submission: June 15, 2021-(updated 10/18/2021) 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: 2021 Model Yr. End: 2022 Make: Thomas Built Buses Model: Saf-T-Liner HDX , Saf-T-Liner C2, Safe-T-Liner EFX School Buses Production Dates: Begin: 01/12/2021 End: 04/06/2021 Descriptive Information: Vehicles built with certain suspect tie rod arm bolts (N308676020022) and steering arm bolts (N308676020025). Number potentially involved: 1,252 Estimated percentage of involve with defect: 2% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: Suspect bolts used to assemble Detroit front axle assemblies have a lengthwise “seam” defect potentially leading to bolt failure. Describe the safety risk: Single bolt fracture may lead to decrease in steering response and both bolts failing would lead to complete loss of steering/directional control of the vehicle increasing the risk of a crash. Identify any warning which can precede or occur: Decrease in steering response If applicable, identify the manufacture of the defective or noncompliant component: Company Name: Cold Heading Company Country: USA Address 1: 21777 Hoover Rd Address 2: City: Warren State: MI Zip/Postal Code: 48089 First Name: Ginger Last Name: Anderson Position: Manager of Corporate Quality Email: ganderson@coldheading.com Phone: 586.497.7000 x6222 Involved Components Component Name: Steering Arm Bolt, Tie Rod Bolt Component Description: Component Part Number: N308676020025, N308676020022 Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: Late February, 2021, despite having no warranty claims nor other indications of failures on customer vehicles, DTNA axle assembly plant reported tie rod bolt and steering arm bolt quality concerns and began containment. Quality alert was issued for axle assembly plant locations. Early March, 2021 DTNA defined suspect bolt lots and cleared inventory. Suspect bolts were sent to supplier for additional analysis. Late March, 2021, DTNA received initial metallurgical report for supplier showing potential for long term fatigue failure. Discussions with supplier ongoing. Early April 2021, even though DTNA is not aware of any field failures related to this concern, DTNA decided to conduct a voluntary safety recall while continuing to investigate the population. October 18, 2021 DIR population reduced to remove vehicles that were contained before being released. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement: Tie rod arm bolts and steering arm bolts 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: 06/10/2021 Planned Dealer Notification End Date: 06/10/2021 Planned Owner Notification Begin Date: 06/10/2021 Planned Owner Notification End Date: 06/10/2021 Manufacture’s identification code for this recall (if applicable): FL-884 DTNA Representative; Larissa Stoffels Executive Manager, Vehicle Safety Compliance and Regulatory Affairs

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Daimler Trucks North America LLC June 2021 FL884 (D21R6) NHTSA #21V-256 (Non-School Bus) NHTSA #21V-255 (School Bus) NHSTA #21E-029 IMPORTANT SAFETY RECALL See enclosed VIN list Subject: DETROITTM Tie Rod & Steering Arm Bolt Replacement Update Models Affected: DETROITTM Model 2 and 3 Steer Axles This notice is sent to you in accordance with the National Traffic and 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, on behalf of its DETROITTM Powertrain Division, has decided that a defect, which relates to motor vehicle safety, exists on certain Detroit Model 2 and 3 steer axles manufactured between Jan 7th, 2021 and Mar 15th, 2021. DTNA is initiating Recall Campaign D21R6 to replace the tie rod and steering arm bolts. On certain Detroit Model 2 and 3 steer axles, the tie rod arm and steering arm bolts used to assemble front axle assemblies have a lengthwise “seam” defect which increases stress concentration, potentially leading to bolt failure or loss of pre-load. At first review, records indicated that your vehicle(s) has one of the affected steering axles. However, further review revealed that the unit(s) listed below was corrected at the OEM manufacturing plant prior to release. Therefore this letter is to inform you that no further work is needed on the vehicle that corresponds to the identification number(s) listed below. If you feel this is not correct, please contact the Warranty Campaigns Department at the numbers below. 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 Detroit Diesel Customer Support Center, 13400 Outer Drive West, Detroit, MI 48239, or call (800) 445-1980 (Eastern Standard Time). Detroit Diesel’s Customer Support Center is open 24 Hours / 7 Days a Week. 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) 3274236 (TTY: 800-424-9153); or to https://www.safercar.gov. We are sorry to cause you this inconvenience. However, we have taken this action in the interest of your continued satisfaction with our products. DETROIT WARRANTY CAMPAIGNS DEPARTMENT Enclosure

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