FL942 – Unexpected Engine Shut Down – 2020-2023 Thomas Built C2 Saf-T-Liner School Buses

Dealers will update the ECM software, free of charge. Owner notification letters were mailed October 28, 2022. Owners may contact DTNA customer service at 1-800-547-0712. DTNA’s number for this recall is FL942.

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Defect / Noncompliance Information Report (Section 573.6) FL942 Date of Submission: 10/19/2022 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: 2020 Model Yr. End: 2023 Make: Thomas Built Bus Model: C2 Saf-T-Liner Production Dates: Begin: 03/07/2019 End: 03/18/2022 Descriptive Information: Certain MY 2018, 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner school buses equipped with a PSI 8.8L LPG fueled engine may stall suddenly without any warning.  If bus, include the number of passengers. 1-74 Basis for Determination of the Recall Population: Certain MY 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner School Buses equipped with a PSI 8.8L LPG fueled engine. Number potentially involved: 461 Estimated percentage of involved with defect: 2% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: On certain C2 Saf-T-Liner school buses equipped with a PSI 8.8L propane fueled engine, while in motion, the ECM may set a code 629/12 and the engine may randomly shut off, without any warning. Describe the safety risk: In certain conditions, an unintended shut down without warning and without the ability to restart the engine, may result in an increased risk of a crash or ultimately could result in the transfer of passengers to alternate transportation in an uncontrolled traffic environment, increasing the risk of injury. Identify any warning which can precede or occur: There is no warning. If applicable, identify the manufacture of the defective or noncompliant component.: Power Solutions International (PSI) Involved Components Component Name: N/A Component Description: N/A Component Part Number: N/A Component’s country of origin: USA Business address: 6450 Muirfield Drive, Hanover Park, IL 60133 Business telephone number: . Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: In late May 2022, DTNA learned of an IC Bus recall in connection with certain 8.8 L propane-powered engines supplied by PSI, which DTNA also uses in its vehicles. Given this recall and the information identified, DTNA proactively assessed its available data to ascertain potential exposure, if any, to its vehicles. The assessment helped to connect limited pieces of information from a problem that DTNA had believed it solved. DTNA’s analysis identified two service reports in or around January 2022 indicating potentially-related stalling phenomena, as well as one customer report from a fleet with error codes indicating emission-related codes, but no stalling. DTNA’s analysis also identified vehicles presenting error codes potentially related to the IC Bus issue in or around late February 2022—but again, without stalling. Given this information, in or around February 2022, DTNA attempted to induce a stalling condition but was unable to do so. At or around the same time, discussed the issue and tested a solution of replacing the ECMs on the affected vehicles, which seemed to resolve the fault codes and any possible stalling issue. Based upon that information, at that time DTNA reasonably concluded those issues to be resolved and not to present an unreasonable risk to motor vehicle safety. The problem was not known to recur until late-May 2022, when DTNA received a report that the fixed vehicles were again stalling and, at approximately the same time, learned of the IC recall. DTNA promptly opened an investigation. While the information available to DTNA through that investigation is unclear, given IC Bus’s recall decision, viewed in conjunction with the contemporaneous stall reports and the information mustered by DTNA during its investigation, on June 17, 2022, out of an abundance of caution and in the interests of safety, DTNA decided to file a recall. To the best of DTNA’s knowledge, there are no reported deaths or injuries related to this issue. In late June, 2022, DTNA discovered that one C2 non-school bus was erroneously included in 22V438’s population. Upon learning of this information, DTNA immediately reviewed all pertinent facts available at the time and began the process of filing an amended DIR. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. A new software update to the engine controller will be installed. Repairs are expected to 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 Truck North America records to determine the customers affected. Planned Dealer Notification Begin Date: 08/19/2022 Planned Dealer Notification End Date: 08/19/2022 Planned Owner Notification Begin Date: 08/19/2022 Planned Owner Notification End Date: 08/19/2022 Does DTNA plan to file inconsequentiality petition? ⃝ Yes x No Manufacturer’s identification code for this recall (if applicable): FL942 DTNA Representative; Sam Geser Manager, Product Defect Investigation Engineering Manager

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Defect / Noncompliance Information Report (Section 573.6) FL942 Date of Submission: 06/27/2022 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: 2020 Model Yr. End: 2023 Make: Thomas Built Bus Model: C2 Saf-T-Liner Production Dates: Begin: 02/05/2019 End: 02/04/2022 Descriptive Information: Certain MY 2018, 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner school buses equipped with a PSI 8.8L LPG fueled engine may stall suddenly without any warning.  If bus, include the number of passengers. 1-74 Basis for Determination of the Recall Population: Certain MY 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner School Buses equipped with a PSI 8.8L LPG fueled engine. Number potentially involved: 461 Estimated percentage of involved with defect: 2% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: On certain C2 Saf-T-Liner school buses equipped with a PSI 8.8L propane fueled engine, while in motion, the ECM may set a code 629/12 and the engine may randomly shut off, without any warning. Describe the safety risk: In certain conditions, an unintended shut down without warning and without the ability to restart the engine, may result in an increased risk of a crash or ultimately could result in the transfer of passengers to alternate transportation in an uncontrolled traffic environment, increasing the risk of injury. Identify any warning which can precede or occur: There is no warning. If applicable, identify the manufacture of the defective or noncompliant component.: Power Solutions International (PSI) Involved Components Component Name: N/A Component Description: N/A Component Part Number: N/A Component’s country of origin: USA Business address: 6450 Muirfield Drive, Hanover Park, IL 60133 Business telephone number: . Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: In late May 2022, DTNA learned of an IC Bus recall in connection with certain 8.8 L propane-powered engines supplied by PSI, which DTNA also uses in its vehicles. Given this recall and the information identified, DTNA proactively assessed its available data to ascertain potential exposure, if any, to its vehicles. The assessment helped to connect limited pieces of information from a problem that DTNA had believed it solved. DTNA’s analysis identified two service reports in or around January 2022 indicating potentially-related stalling phenomena, as well as one customer report from a fleet with error codes indicating emissionrelated codes, but no stalling. DTNA’s analysis also identified vehicles presenting error codes potentially related to the IC Bus issue in or around late February 2022—but again, without stalling. Given this information, in or around February 2022, DTNA attempted to induce a stalling condition but was unable to do so. At or around the same time, discussed the issue and tested a solution of replacing the ECMs on the affected vehicles, which seemed to resolve the fault codes and any possible stalling issue. Based upon that information, at that time DTNA reasonably concluded those issues to be resolved and not to present an unreasonable risk to motor vehicle safety. The problem was not known to recur until late- May 2022, when DTNA received a report that the fixed vehicles were again stalling and, at approximately the same time, learned of the IC recall. DTNA promptly opened an investigation. While the information available to DTNA through that investigation is unclear, given IC Bus’s recall decision, viewed in conjunction with the contemporaneous stall reports and the information mustered by DTNA during its investigation, on June 17, 2022, out of an abundance of caution and in the interests of safety, DTNA decided to file a recall. To the best of DTNA’s knowledge, there are no reported deaths or injuries related to this issue. In late June, 2022, DTNA discovered that one C2 non-school bus was erroneously included in 22V438’s population. Upon learning of this information, DTNA immediately reviewed all pertinent facts available at the time and began the process of filing an amended DIR. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. DTNA is currently working with Power Solutions International (PSI) to develop a remedy. Root cause has not yet been identified. Repairs are expected to 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 Truck North America records to determine the customers affected. Planned Dealer Notification Begin Date: 08/19/2022 Planned Dealer Notification End Date: 08/19/2022 Planned Owner Notification Begin Date: 08/19/2022 Planned Owner Notification End Date: 08/19/2022 Does DTNA plan to file inconsequentiality petition? ⃝ Yes x No Manufacturer’s identification code for this recall (if applicable): FL942 DTNA Representative; Sam Geser Manager, Product Defect Investigation Engineering Manager

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Defect / Noncompliance Information Report (Section 573.6) FL942 Date of Submission: 06/21/2022 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: 2020 Model Yr. End: 2023 Make: Thomas Built Bus Model: C2 Saf-T-Liner Production Dates: Begin: 02/05/2019 End: 02/04/2022 Descriptive Information: Certain MY 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner school buses equipped with a PSI 8.8L LPG fueled engine may stall suddenly without any warning.  If bus, include the number of passengers. 1-74 Basis for Determination of the Recall Population: Certain MY 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner School Buses equipped with a PSI 8.8L LPG fueled engine. Number potentially involved: 468 Estimated percentage of involved with defect: 2% Defect / Noncompliance Description For this Defect/Noncompliance: Describe the defect or noncompliance: On certain C2 Saf-T-Liner school buses equipped with a PSI 8.8L propane fueled engine, while in motion, the ECM may set a code 629/12 and the engine may randomly shut off, without any warning. Describe the safety risk: In certain conditions, an unintended shut down without warning and without the ability to restart the engine, may result in an increased risk of a crash or ultimately could result in the transfer of passengers to alternate transportation in an uncontrolled traffic environment, increasing the risk of injury. Identify any warning which can precede or occur: There is no warning. If applicable, identify the manufacture of the defective or noncompliant component.: Power Solutions International (PSI) Involved Components Component Name: N/A Component Description: N/A Component Part Number: N/A Component’s country of origin: USA Business address: 6450 Muirfield Drive, Hanover Park, IL 60133 Business telephone number: . Chronology of Defect / Noncompliance Determination Provide the chronology of events leading up to the defect decision or test data for the noncompliance decision: In late May 2022, DTNA learned of an IC Bus recall in connection with certain 8.8 L propane-powered engines supplied by PSI, which DTNA also uses in its vehicles. Given this recall and the information identified, DTNA proactively assessed its available data to ascertain potential exposure, if any, to its vehicles. The assessment helped to connect limited pieces of information from a problem that DTNA had believed it solved. DTNA’s analysis identified two service reports in or around January 2022 indicating potentially-related stalling phenomena, as well as one customer report from a fleet with error codes indicating emission-related codes, but no stalling. DTNA’s analysis also identified vehicles presenting error codes potentially related to the IC Bus issue in or around late February 2022—but again, without stalling. Given this information, in or around February 2022, DTNA attempted to induce a stalling condition but was unable to do so. At or around the same time, discussed the issue and tested a solution of replacing the ECMs on the affected vehicles, which seemed to resolve the fault codes and any possible stalling issue. Based upon that information, at that time DTNA reasonably concluded those issues to be resolved and not to present an unreasonable risk to motor vehicle safety. The problem was not known to recur until late-May 2022, when DTNA received a report that the fixed vehicles were again stalling and, at approximately the same time, learned of the IC recall. DTNA promptly opened an investigation. While the information available to DTNA through that investigation is unclear, given IC Bus’s recall decision, viewed in conjunction with the contemporaneous stall reports and the information mustered by DTNA during its investigation, on June 17, 2022, out of an abundance of caution and in the interests of safety, DTNA decided to file a recall. To the best of DTNA’s knowledge, there are no reported deaths or injuries related to this issue. Identify the Remedy Describe the defect/noncompliance remedy program, including the manufacture’s plan for reimbursement. DTNA is currently working with Power Solutions International (PSI) to develop a remedy. Root cause has not yet been identified. Repairs are expected to 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 Truck North America records to determine the customers affected. Planned Dealer Notification Begin Date: 08/19/2022 Planned Dealer Notification End Date: 08/19/2022 Planned Owner Notification Begin Date: 08/19/2022 Planned Owner Notification End Date: 08/19/2022 Does DTNA plan to file inconsequentiality petition? ⃝ Yes x No Manufacturer’s identification code for this recall (if applicable): FL942 DTNA Representative; Tiffani Torgeson Manager, Compliance and Regulatory Affairs

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Classified as MB Internal Daimler Trucks North America LLC August 2022 FL942 Interim Recall Notice NHTSA #22V-439 (Non-School Bus) NHTSA #22V-438 (School Bus) IMPORTANT SAFETY RECALL See enclosed VIN list Subject: FCCC S2G and TBB C2 Saf-T-Liner LPG Engine Stall This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Truck 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 in certain Model Year 2019-2023 FCCC S2G and TBB C2 Saf-T-Liner vehicles manufactured February 5, 2019, through March 1, 2022, equipped with PSI 8.8L LPG fueled engine. On certain TBB C2 Saf-T-Liners and FCCC S2G vehicles, while in motion, the engine control module (ECM) may set a code code 629/12 causing the engine to randomly shut off without warning. An unintended shut down without warning and without the abiltiy to restart the engine may result in an increased risk of a crash or could result in the transfer of passengers to alter- nate transportation in an uncontrolled traffic environment, increasing the risk of injury. 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. Daimler Trucks is currently working on a solution. There is no action for you to take at this time. The second notice will inform you when the free, final remedy is available. When you receive the second notice, please contact your authorized Daimler Trucks North America 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 [email protected]. 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

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Daimler Truck North America LLC October 2022 FL942AB NHTSA #22V-439 (Non-School Bus) NHTSA #22V-438 (School Bus) IMPORTANT SAFETY RECALL This notice applies to your vehicle Subject: FCCC and TBB ECM Software Update This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Truck 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 in certain Model Year 2019-2023 FCCC S2G and TBB Saf-T-Liner C2 vehicles manufactured March 7, 2019, through March 18, 2022, and equipped with LPG engines. On certain vehicles, while in motion, the engine control module (ECM) may set a code 629/12, causing the engine to randomly shut off without warning. An unintended shut down without warning and without the ability to restart the engine may result in an increased risk of a crash or could result in the transfer of passengers to alternate transportation in an uncontrolled traffic environment, increasing the risk of injury. Vehicles will receive an ECM software update to resolve this issue. Repairs will be performed by Daimler Truck North America authorized service facilities. This is the second notice regarding this recall. The final recall repair is now available. 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 1 hour and will be performed at no charge to you. To locate an authorized dealer, search online at Daimler-TruckNorthAmerica.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 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 [email protected]. 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 Truck North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone Daimler Truck 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 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 Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone

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Daimler Truck North America LLC October 2022 FL942A NHTSA #22V-439 (Non-School Bus) NHTSA #22V-438 (School Bus) IMPORTANT SAFETY RECALL Subject: FCCC S2G and TBB Saf-T-Liner C2 LPG Engine Stall This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Daimler Truck 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 in certain Model Year 2019-2023 FCCC S2G and TBB Saf-T-Liner C2 vehicles manufactured February 5, 2019, through March 1, 2022, equipped with PSI 8.8L LPG fueled engine. On certain S2G and Saf-T-Liner C2 vehicles, while in motion, the engine control module (ECM) may set a code 629/12 causing the engine to randomly shut off without warning. An unintended shut down without warning and without the ability to restart the engine may result in an increased risk of a crash or could result in the transfer of passengers to alternate transportation in an uncontrolled traffic environment, increasing the risk of injury. Vehicles will receive an ECM software update to eliminate the potential intermittent stalling. Repairs will be performed by Daimler Truck North America authorized service facilities. This is the second notice regarding this recall. The final recall repair is now available. 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 1 hour and will be performed at no charge to you. To locate an authorized dealer, search online at Daimler-TruckNorthAmerica.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 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 [email protected]. 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 Truck North America LLC Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone Daimler Truck 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 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 Warranty Campaigns Department P.O. Box 4090 Portland, OR 97208-4090 800.547.0712 Phone

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-438 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : OCT 20, 2022 NHTSA Recall No. : 22V-438 Manufacturer Recall No. : FL942 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 : 461 Estimated percentage with defect : 2 % Vehicle Information : Vehicle 1 : 2020-2023 Thomas Built Bus Saf-T-Liner C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : Certain MY 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner school buses equipped with a PSI 8.8L LPG fueled engine may stall suddenly without any warning. Production Dates : MAR 07, 2019 – MAR 18, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : On certain C2 Saf-T-Liner school buses equipped with a PSI 8.8L propane fueled engine, while in motion, the ECM may set a code 629/12 and the engine may randomly shut off, without any warning. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : In certain conditions, an unintended shut down without warning and without the ability to restart the engine, may result in an increased risk of a crash or ultimately could result in the transfer of passengers to alternate transportation in an uncontrolled traffic environment, increasing the risk of injury. Description of the Cause : NR Identification of Any Warning that can Occur : There is no warning. Involved Components : Part 573 Safety Recall Report 22V-438 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : unknown Component Description : unknown Component Part Number : unknown Supplier Identification : Component Manufacturer Name : Power Solutions International (PSI) Address : 6450 Muirfield Drive HanoverPark Illinois 60133 Country : United States Chronology : In late May 2022, DTNA learned of an IC Bus recall in connection with certain 8.8 L propane-powered engines supplied by PSI, which DTNA also uses in its vehicles. Given this recall and the information identified, DTNA proactively assessed its available data to ascertain potential exposure, if any, to its vehicles. The assessment helped to connect limited pieces of information from a problem that DTNA had believed it solved. DTNA’s analysis identified two service reports in or around January 2022 indicating potentially-related stalling phenomena, as well as one customer report from a fleet with error codes indicating emission related codes, but no stalling. DTNA’s analysis also identified vehicles presenting error codes potentially related to the IC Bus issue in or around late February 2022—but again, without stalling. Given this information, in or around February 2022, DTNA attempted to induce a stalling condition but was unable to do so. At or around the same time, discussed the issue and tested a solution of replacing the ECMs on the affected vehicles, which seemed to resolve the fault codes and any possible stalling issue. Based upon that information, at that time DTNA reasonably concluded those issues to be resolved and not to present an unreasonable risk to motor vehicle safety. The problem was not known to recur until late- May 2022, when DTNA received a report that the fixed vehicles were again stalling and, at approximately the same time, learned of the IC recall. DTNA promptly opened an investigation. While the information available to DTNA through that investigation is unclear, given IC Bus’s recall decision, viewed in conjunction with the contemporaneous stall reports and the information mustered by DTNA during its investigation, on June 17, 2022, out of an abundance of caution and in the interests of safety, DTNA decided to file a recall. To the best of DTNA’s knowledge, there are no reported deaths or… see attached for more Part 573 Safety Recall Report 22V-438 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : A new software update to the engine controller will be installed. Repairs are expected to be performed by Daimler Trucks North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. 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 Truck North America records to determine the customers affected. Planned Dealer Notification Date : AUG 19, 2022 – AUG 19, 2022 Planned Owner Notification Date : AUG 19, 2022 – AUG 19, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-438 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : JUN 30, 2022 NHTSA Recall No. : 22V-438 Manufacturer Recall No. : FL942 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 : 461 Estimated percentage with defect : 2 % Vehicle Information : Vehicle 1 : 2020-2023 Thomas Built Bus Saf-T-Liner C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : Certain MY 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner school buses equipped with a PSI 8.8L LPG fueled engine may stall suddenly without any warning. Production Dates : FEB 05, 2019 – FEB 04, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : On certain C2 Saf-T-Liner school buses equipped with a PSI 8.8L propane fueled engine, while in motion, the ECM may set a code 629/12 and the engine may randomly shut off, without any warning. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : In certain conditions, an unintended shut down without warning and without the ability to restart the engine, may result in an increased risk of a crash or ultimately could result in the transfer of passengers to alternate transportation in an uncontrolled traffic environment, increasing the risk of injury. Description of the Cause : NR Identification of Any Warning that can Occur : There is no warning. Involved Components : Part 573 Safety Recall Report 22V-438 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : unknown Component Description : unknown Component Part Number : unknown Supplier Identification : Component Manufacturer Name : Power Solutions International (PSI) Address : 6450 Muirfield Drive HanoverPark Illinois 60133 Country : United States Chronology : In late May 2022, DTNA learned of an IC Bus recall in connection with certain 8.8 L propane-powered engines supplied by PSI, which DTNA also uses in its vehicles. Given this recall and the information identified, DTNA proactively assessed its available data to ascertain potential exposure, if any, to its vehicles. The assessment helped to connect limited pieces of information from a problem that DTNA had believed it solved. DTNA’s analysis identified two service reports in or around January 2022 indicating potentially-related stalling phenomena, as well as one customer report from a fleet with error codes indicating emission related codes, but no stalling. DTNA’s analysis also identified vehicles presenting error codes potentially related to the IC Bus issue in or around late February 2022—but again, without stalling. Given this information, in or around February 2022, DTNA attempted to induce a stalling condition but was unable to do so. At or around the same time, discussed the issue and tested a solution of replacing the ECMs on the affected vehicles, which seemed to resolve the fault codes and any possible stalling issue. Based upon that information, at that time DTNA reasonably concluded those issues to be resolved and not to present an unreasonable risk to motor vehicle safety. The problem was not known to recur until late- May 2022, when DTNA received a report that the fixed vehicles were again stalling and, at approximately the same time, learned of the IC recall. DTNA promptly opened an investigation. While the information available to DTNA through that investigation is unclear, given IC Bus’s recall decision, viewed in conjunction with the contemporaneous stall reports and the information mustered by DTNA during its investigation, on June 17, 2022, out of an abundance of caution and in the interests of safety, DTNA decided to file a recall. To the best of DTNA’s knowledge, there are no reported deaths or… see attached for more Part 573 Safety Recall Report 22V-438 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : DTNA is currently working with Power Solutions International (PSI) to develop a remedy. Root cause has not yet been identified. Repairs are expected to be performed by Daimler Trucks North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. 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 Truck North America records to determine the customers affected. Planned Dealer Notification Date : AUG 19, 2022 – AUG 19, 2022 Planned Owner Notification Date : AUG 19, 2022 – AUG 19, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-438 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : JUN 20, 2022 NHTSA Recall No. : 22V-438 Manufacturer Recall No. : FL942 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 : 468 Estimated percentage with defect : 2 % Vehicle Information : Vehicle 1 : 2020-2023 Thomas Built Bus Saf-T-Liner C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : Certain MY 2020 thru 2023 Thomas Built Bus C2 Saf-T-Liner school buses equipped with a PSI 8.8L LPG fueled engine may stall suddenly without any warning. Production Dates : FEB 05, 2019 – FEB 04, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : On certain C2 Saf-T-Liner school buses equipped with a PSI 8.8L propane fueled engine, while in motion, the ECM may set a code 629/12 and the engine may randomly shut off, without any warning. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : In certain conditions, an unintended shut down without warning and without the ability to restart the engine, may result in an increased risk of a crash or ultimately could result in the transfer of passengers to alternate transportation in an uncontrolled traffic environment, increasing the risk of injury. Description of the Cause : NR Identification of Any Warning that can Occur : There is no warning. Involved Components : Part 573 Safety Recall Report 22V-438 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Component Name 1 : unknown Component Description : unknown Component Part Number : unknown Supplier Identification : Component Manufacturer Name : Power Solutions International (PSI) Address : 6450 Muirfield Drive HanoverPark Illinois 60133 Country : United States Chronology : In late May 2022, DTNA learned of an IC Bus recall in connection with certain 8.8 L propane-powered engines supplied by PSI, which DTNA also uses in its vehicles. Given this recall and the information identified, DTNA proactively assessed its available data to ascertain potential exposure, if any, to its vehicles. The assessment helped to connect limited pieces of information from a problem that DTNA had believed it solved. DTNA’s analysis identified two service reports in or around January 2022 indicating potentially-related stalling phenomena, as well as one customer report from a fleet with error codes indicating emission related codes, but no stalling. DTNA’s analysis also identified vehicles presenting error codes potentially related to the IC Bus issue in or around late February 2022—but again, without stalling. Given this information, in or around February 2022, DTNA attempted to induce a stalling condition but was unable to do so. At or around the same time, discussed the issue and tested a solution of replacing the ECMs on the affected vehicles, which seemed to resolve the fault codes and any possible stalling issue. Based upon that information, at that time DTNA reasonably concluded those issues to be resolved and not to present an unreasonable risk to motor vehicle safety. The problem was not known to recur until late- May 2022, when DTNA received a report that the fixed vehicles were again stalling and, at approximately the same time, learned of the IC recall. DTNA promptly opened an investigation. While the information available to DTNA through that investigation is unclear, given IC Bus’s recall decision, viewed in conjunction with the contemporaneous stall reports and the information mustered by DTNA during its investigation, on June 17, 2022, out of an abundance of caution and in the interests of safety, DTNA decided to file a recall. To the best of DTNA’s knowledge, there are no reported deaths or injuries related to this issue. Part 573 Safety Recall Report 22V-438 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : DTNA is currently working with Power Solutions International (PSI) to develop a remedy. Root cause has not yet been identified. Repairs are expected to be performed by Daimler Trucks North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. 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 Truck North America records to determine the customers affected. Planned Dealer Notification Date : AUG 19, 2022 – AUG 19, 2022 Planned Owner Notification Date : AUG 19, 2022 – AUG 19, 2022 * NR – Not Reported

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