FL981 – AC Electrical Connection May Overheat – 2024 Thomas Built Buses SAF-T-Liner C2 School Buses

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Pending TBB SAF-T-LINER C2 Recall Campaign FL981 Communication Type: Campaigns Date: 9/7/2023 The Dealer Network is informed that a SAFETY RECALL NOTIFICATION has been sent to NHTSA notifying them of an approved DTNA vehicle Recall Campaign: FL981: TBB SAF-T-LINER C2 AC Electrical Wiring NHTSA#: TBD Make: Thomas Built Buses Model: SAF-T-LINER C2 Model Year: 2024 Manufacture Dates: May 1, 2023 -August 31, 2023 At Issue: The affected vehicles are equipped with factory installed Air Conditioners that include NC components where the electrical cables may be loose or improperly installed. If the NC electrical cables are loose or improperly installed, when the NC is in use, this may lead to excessive heat buildup at the electrical connection which can increase the risk of a vehicle fire. Reason for this Action: In an abundance of caution, DTNA will contact the Customer of Record on the suspect population, ahead of mailing the Final Recall Notification, to advise the Customer to contact their Servicing Dealer to have their vehicle visually inspected to determine if the defect is evident on the vehicle (see attached defect inspection procedure). Remedy Description: DTNA will inspect the NC electrical cables on the affected vehicles. If the electrical cables are found to be loose or improperly installed, they will be properly fastened or reinstalled with sufficient torque. Repairs will be performed free of charge by Daimler Truck North America authorized service facilities. Remedy Availability: The remedy is available as of 9/7/2023. Please see attached Inspection and Work Instructions. Notice: It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied. Some of the vehicles subject to this “Stop Delivery Order” may be in your new vehicle inventory. Until further instructions are available, new vehicles subject to this “Stop Delivery Order” must be held and not be delivered to customers. Required Action: The Dealer Network is to inspect the vehicle. If the defect is found the Dealer is to contact the TBB Customer Assistance Center (1-855-253-0419) for instructions on how to return the vehicle to service, as well as the documentation of vehicle’s inspection. Thank you, DTNA Campaign Management Attachments: FL981 TBB AC Electrical Inspection Procedure_Final.pdf (//dtnacontentdtna. prd.freightliner.com/c ontent/dam/mycommunications/ aftermark et/FL981 %20TBB%20AC %20Electrical%20Inspecti on%20Procedure_Final.p df) DAIMLER TRUCK NORTH AMERICA | 4555 N CHANNEL AVE, PORTLAND, OR 97217 | 503.745.8000 | WWW.DAIMLERTRUCKNORTHAMERICA.COM Inspection and Work Instructions Subject: TBB SAF-T-LINER C2 A/C Electrical Wiring Models Affected: Specific model year 2024 Thomas Built Buses Saf-T-Liner C2 school buses, manufactured May 1, 2023, through August 31, 2023. Problem: The affected vehicles are equipped with factory installed Air Conditioners that include A/C components where the electrical cables may be loose or improperly installed. If the A/C electrical cables are loose or improperly installed, when the A/C is in use, this may lead to excessive heat buildup at the electrical connection which can increase the risk of a vehicle fire. Shop Safety Requirements: In order to perform any repairs in your shop, pay close attention to the following safety requirements. • Ensure that personal protective equipment is worn per Company policy. • Set the parking brake. • Remove the ignition key • Chock front and rear wheels on a level surface • Turn battery disconnect switch to the off position DAIMLER TRUCK North America DAIMLER TRUCK NORTH AMERICA | 4555 N CHANNEL AVE, PORTLAND, OR 97217 | 503.745.8000 | WWW.DAIMLERTRUCKNORTHAMERICA.COM Inspection and Work Procedure: Ground studs – front side evaporator: Remove 2 square head screws that hold in place the glove box inner liner located left of driver side overhead compartment. Check nut on the grounding stud for tightness. If loose, tighten (recommended torque 95 in-lbs). If the ground stud happens to break, move the ground to a separate stud. If the nut was not tight, inspect the wiring for any damage – if there is damage to the ground wire, contact TBB for further guidance. DAIMLER TRUCK North America ……… . …, . …. DAIMLER TRUCK NORTH AMERICA | 4555 N CHANNEL AVE, PORTLAND, OR 97217 | 503.745.8000 | WWW.DAIMLERTRUCKNORTHAMERICA.COM Ground stud – rear evaporator: Remove 2-3 phillips style screws from brackets holding plastic curtain molding to be able to pull the curtain molding away enough to expose the metal header with the ground studs. Check nut on the grounding stud for tightness. If loose, tighten (recommended torque 95 in-lbs). If the ground stud happens to break, move the ground to a separate stud. If the nut was not tight, inspect the wiring for any damage – if there is damage to the ground wire, contact TBB for further guidance. DAIMLER TRUCK North America .. . – -.. -. .. – … … ….. . .. . .. ·.-/.-:.•.::.:.:.:.: ~: :: \<<·-:·.:·.:·.\ \’· DAIMLER TRUCK NORTH AMERICA | 4555 N CHANNEL AVE, PORTLAND, OR 97217 | 503.745.8000 | WWW.DAIMLERTRUCKNORTHAMERICA.COM Connections inside A/C box: Open the cover of the first door behind the battery compartment. Check for tightness of nuts attaching cables to the BCC control modules. Recommended torque is 95 in-lbs on the B (+) connectors between the cables and the megafuses. Check all connections to the bus bar on the control modules – joints should not be loose – torque nuts connecting wires to bus bar to 24-32 in-lbs if loose. Check all crimped connection joints – wires should be firmly connected. DAIMLER TRUCK North America

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-621 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : SEP 06, 2023 NHTSA Recall No. : 23V-621 Manufacturer Recall No. : FL981 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 : 259 Estimated percentage with defect : 10 % Vehicle Information : Vehicle 1 : 2024-2024 Thomas Built Buses SAF-T-LINER C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : A defect, which relates to motor vehicle safety, exists in certain Thomas Built Bus SAF-T-LINER C2 2024 vehicles. The affected vehicles, are equipped with Air Conditioners that include an A/C component where the electrical cables may be loose or improperly installed. This may result in excessive heat buildup at the cable connection and can increase the risk of a vehicle fire. Vehicles built in the above manufacturing date range have an A/C component that was installed outside of the normal production process. Production Dates : MAY 01, 2023 – AUG 31, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : A defect, which relates to motor vehicle safety, exists in certain Thomas Built Buses Saf-T-Liner C2 2024 vehicles. The affected vehicles are equipped with factory installed Air Conditioners that include A/C components where the electrical cables may be loose or improperly installed. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the A/C electrical cables are loose or improperly installed, when the A/C is in use, this may lead to excessive heat buildup at the electrical connection which can increase the risk of a vehicle fire. Description of the Cause : NR Identification of Any Warning that can Occur : Air conditioner may not work or work intermittently. Part 573 Safety Recall Report 23V-621 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : A/C Evaporator Component Description : A/C Evaporator Component Part Number : TBB 233164 Supplier Identification : Component Manufacturer Name : Thomas Built Buses Address : 1408 Courtesy Road High Point North Carolina 27260 Country : United States Chronology : On or about August 16, 2023, DTNA was notified of a fire on a vehicle that was recently put into service. DTNA inspected the vehicle and found that the fire appeared to originate in or near the driver overhead console and occurred while the A/C was in use. A closer examination of the A/C electrical cable on this vehicle indicated the presence of a loose cable connection. Additional vehicles recently delivered to the same customer facility were examined and some were also found to have loose A/C electrical cables. DTNA also examined other recently built vehicles at the manufacturing facility and found additional vehicles with loose or improperly installed A/C electrical cables. DTNA’s investigation that revealed that each of the vehicles with a loose or improperly installed electrical cable had the A/C components installed outside of the normal production process. On September 5, 2023, out of abundance of caution, DTNA decided to conduct a voluntary safety recall on certain TBB Saf-T-Liner C2 vehicles built within the above-mentioned manufacturing date range, that were equipped with factory installed A/C components that were installed outside of the normal production process. The summary of warranty claims, field or service reports, and other information is as follows: 0 warranty claims and 1 Field report. No deaths or injuries reported. Part 573 Safety Recall Report 23V-621 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : DTNA will inspect the A/C electrical cables on the affected vehicles. If the electrical cables are found to be loose or improperly installed, they will be properly fastened or reinstalled with sufficient torque. Repairs will be performed free of charge by Daimler Truck North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : Vehicle that have been remedied will have AC electrical cable inspected and if necessary, properly fasten or reinstalled. Identify How/When Recall Condition was Corrected in Production : For vehicles where AC components were installed outside of the normal production process a 100% inspection check has been implemented and process has been enhanced. Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Date : NOV 05, 2023 – NOV 05, 2023 Planned Owner Notification Date : NOV 05, 2023 – NOV 05, 2023 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-621 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : SEP 07, 2023 NHTSA Recall No. : 23V-621 Manufacturer Recall No. : FL981 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 : 259 Estimated percentage with defect : 10 % Vehicle Information : Vehicle 1 : 2024-2024 Thomas Built Buses SAF-T-LINER C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : A defect, which relates to motor vehicle safety, exists in certain Thomas Built Bus SAF-T-LINER C2 2024 vehicles. The affected vehicles, are equipped with Air Conditioners that include an A/C component where the electrical cables may be loose or improperly installed. This may result in excessive heat buildup at the cable connection and can increase the risk of a vehicle fire. Vehicles built in the above manufacturing date range have an A/C component that was installed outside of the normal production process. Production Dates : MAY 01, 2023 – AUG 31, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : A defect, which relates to motor vehicle safety, exists in certain Thomas Built Buses Saf-T-Liner C2 2024 vehicles. The affected vehicles are equipped with factory installed Air Conditioners that include A/C components where the electrical cables may be loose or improperly installed. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the A/C electrical cables are loose or improperly installed, when the A/C is in use, this may lead to excessive heat buildup at the electrical connection which can increase the risk of a vehicle fire. Description of the Cause : NR Identification of Any Warning that can Occur : Air conditioner may not work or work intermittently. Part 573 Safety Recall Report 23V-621 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : A/C Evaporator Component Description : A/C Evaporator Component Part Number : TBB 233164 Component Name 2 : Control Module Assembly, A/C Component Description : Control Module Assembly, A/C Component Part Number : 170619 Supplier Identification : Component Manufacturer Name : Thomas Built Buses Address : 1408 Courtesy Road High Point North Carolina 27260 Country : United States Chronology : On or about August 16, 2023, DTNA was notified of a fire on a vehicle that was recently put into service. DTNA inspected the vehicle and found that the fire appeared to originate in or near the driver overhead console and occurred while the A/C was in use. A closer examination of the A/C electrical cable on this vehicle indicated the presence of a loose cable connection. Additional vehicles recently delivered to the same customer facility were examined and some were also found to have loose A/C electrical cables. DTNA also examined other recently built vehicles at the manufacturing facility and found additional vehicles with loose or improperly installed A/C electrical cables. DTNA’s investigation that revealed that each of the vehicles with a loose or improperly installed electrical cable had the A/C components installed outside of the normal production process. On September 5, 2023, out of abundance of caution, DTNA decided to conduct a voluntary safety recall on certain TBB Saf-T-Liner C2 vehicles built within the above-mentioned manufacturing date range, that were equipped with factory installed A/C components that were installed outside of the normal production process. The summary of warranty claims, field or service reports, and other information is as follows: 0 warranty claims and 1 Field report. No deaths or injuries reported. Part 573 Safety Recall Report 23V-621 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : DTNA will inspect the A/C electrical cables on the affected vehicles. If the electrical cables are found to be loose or improperly installed, they will be properly fastened or reinstalled with sufficient torque. Repairs will be performed free of charge by Daimler Truck North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : Vehicle that have been remedied will have AC electrical cable inspected and if necessary, properly fasten or reinstalled. Identify How/When Recall Condition was Corrected in Production : For vehicles where AC components were installed outside of the normal production process a 100% inspection check has been implemented and process has been enhanced. Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Date : SEP 07, 2023 – OCT 06, 2023 Planned Owner Notification Date : OCT 06, 2023 – OCT 06, 2023 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-621 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : SEP 19, 2023 NHTSA Recall No. : 23V-621 Manufacturer Recall No. : FL981 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 : 679 Estimated percentage with defect : 10 % Vehicle Information : Vehicle 1 : 2024-2024 Thomas Built Buses SAF-T-LINER C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : A defect, which relates to motor vehicle safety, exists in certain Thomas Built Bus SAF-T-LINER C2 2024 vehicles. The affected vehicles, are equipped with Air Conditioners that include an A/C component where the electrical cables may be loose or improperly installed. This may result in excessive heat buildup at the cable connection and can increase the risk of a vehicle fire. Vehicles built in the above manufacturing date range have an A/C component that was installed outside of the normal production process. Production Dates : MAY 01, 2023 – AUG 31, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : A defect, which relates to motor vehicle safety, exists in certain Thomas Built Buses Saf-T-Liner C2 2024 vehicles. The affected vehicles are equipped with factory installed Air Conditioners that include A/C components where the electrical cables may be loose or improperly installed. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the A/C electrical cables are loose or improperly installed, when the A/C is in use, this may lead to excessive heat buildup at the electrical connection which can increase the risk of a vehicle fire. Description of the Cause : NR Identification of Any Warning that can Occur : Air conditioner may not work or work intermittently. Part 573 Safety Recall Report 23V-621 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : A/C Evaporator Component Description : A/C Evaporator Component Part Number : 233164 Component Name 2 : Control Module Assembly, A/C Component Description : Control Module Assembly, A/C Component Part Number : 170619 Supplier Identification : Component Manufacturer Name : Thomas Built Buses Address : 1408 Courtesy Road High Point North Carolina 27260 Country : United States Chronology : On or about August 16, 2023, DTNA was notified of a fire on a vehicle that was recently put into service. DTNA inspected the vehicle and found that the fire appeared to originate in or near the driver overhead console and occurred while the A/C was in use. A closer examination of the A/C electrical cable on this vehicle indicated the presence of a loose cable connection. Additional vehicles recently delivered to the same customer facility were examined and some were also found to have loose A/C electrical cables. DTNA also examined other recently built vehicles at the manufacturing facility and found additional vehicles with loose or improperly installed A/C electrical cables. DTNA’s investigation that revealed that each of the vehicles with a loose or improperly installed electrical cable had the A/C components installed outside of the normal production process. On September 5, 2023, out of abundance of caution, DTNA decided to conduct a voluntary safety recall on certain TBB Saf-T-Liner C2 vehicles built within the above-mentioned manufacturing date range, that were equipped with factory installed A/C components that were installed outside of the normal production process. The summary of warranty claims, field or service reports, and other information is as follows: 0 warranty claims and 1 Field report. No deaths or injuries reported. DTNA continued to review build data and on September 13, 2023, DTNA identified an additional group of buses that had AC system components installed outside of the normal manufacturing process. Because this issue only impacts units that were manufactured outside of the normal production process, DTNA continued to review various internal databases to ensure all potentially affected vehicles were accounted for. Part 573 Safety Recall Report 23V-621 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 On September 19, 2023, DTNA updated the vehicle population to include a small number of additional vehicles that were built outside the standard manufacturing process. Description of Remedy : Description of Remedy Program : DTNA will inspect and tighten the electrical cables as necessary. Repairs will be performed free of charge by Daimler Truck North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : Vehicle that have been remedied will have AC electrical cable inspected and if necessary, properly fasten or reinstalled. Identify How/When Recall Condition was Corrected in Production : For vehicles where AC components were installed outside of the normal production process a 100% inspection check has been implemented and process has been enhanced. Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Date : SEP 07, 2023 – OCT 06, 2023 Planned Owner Notification Date : OCT 06, 2023 – OCT 06, 2023 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-621 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Daimler Trucks North America, LLC Submission Date : SEP 13, 2023 NHTSA Recall No. : 23V-621 Manufacturer Recall No. : FL981 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 : 671 Estimated percentage with defect : 10 % Vehicle Information : Vehicle 1 : 2024-2024 Thomas Built Buses SAF-T-LINER C2 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : A defect, which relates to motor vehicle safety, exists in certain Thomas Built Bus SAF-T-LINER C2 2024 vehicles. The affected vehicles, are equipped with Air Conditioners that include an A/C component where the electrical cables may be loose or improperly installed. This may result in excessive heat buildup at the cable connection and can increase the risk of a vehicle fire. Vehicles built in the above manufacturing date range have an A/C component that was installed outside of the normal production process. Production Dates : MAY 01, 2023 – AUG 31, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : A defect, which relates to motor vehicle safety, exists in certain Thomas Built Buses Saf-T-Liner C2 2024 vehicles. The affected vehicles are equipped with factory installed Air Conditioners that include A/C components where the electrical cables may be loose or improperly installed. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : If the A/C electrical cables are loose or improperly installed, when the A/C is in use, this may lead to excessive heat buildup at the electrical connection which can increase the risk of a vehicle fire. Description of the Cause : NR Identification of Any Warning that can Occur : Air conditioner may not work or work intermittently. Part 573 Safety Recall Report 23V-621 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : A/C Evaporator Component Description : A/C Evaporator Component Part Number : 233164 Component Name 2 : Control Module Assembly, A/C Component Description : Control Module Assembly, A/C Component Part Number : 170619 Supplier Identification : Component Manufacturer Name : Thomas Built Buses Address : 1408 Courtesy Road High Point North Carolina 27260 Country : United States Chronology : On or about August 16, 2023, DTNA was notified of a fire on a vehicle that was recently put into service. DTNA inspected the vehicle and found that the fire appeared to originate in or near the driver overhead console and occurred while the A/C was in use. A closer examination of the A/C electrical cable on this vehicle indicated the presence of a loose cable connection. Additional vehicles recently delivered to the same customer facility were examined and some were also found to have loose A/C electrical cables. DTNA also examined other recently built vehicles at the manufacturing facility and found additional vehicles with loose or improperly installed A/C electrical cables. DTNA’s investigation that revealed that each of the vehicles with a loose or improperly installed electrical cable had the A/C components installed outside of the normal production process. On September 5, 2023, out of abundance of caution, DTNA decided to conduct a voluntary safety recall on certain TBB Saf-T-Liner C2 vehicles built within the above-mentioned manufacturing date range, that were equipped with factory installed A/C components that were installed outside of the normal production process. The summary of warranty claims, field or service reports, and other information is as follows: 0 warranty claims and 1 Field report. No deaths or injuries reported. DTNA continued to review build data and on September 13, 2023, DTNA identified an additional group of buses that had AC system components installed outside of the normal manufacturing process. Part 573 Safety Recall Report 23V-621 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : DTNA will inspect the A/C electrical cables on the affected vehicles. If the electrical cables are found to be loose or improperly installed, they will be properly fastened or reinstalled with sufficient torque. Repairs will be performed free of charge by Daimler Truck North America authorized service facilities. Details of the reimbursement plan will be included in the owner’s notification letter. Owners are directed to seek reimbursement through authorized dealers. How Remedy Component Differs from Recalled Component : Vehicle that have been remedied will have AC electrical cable inspected and if necessary, properly fasten or reinstalled. Identify How/When Recall Condition was Corrected in Production : For vehicles where AC components were installed outside of the normal production process a 100% inspection check has been implemented and process has been enhanced. Recall Schedule : Description of Recall Schedule : Customer notification will be made by first class mail using Daimler Trucks North America records to determine the customers affected. Planned Dealer Notification Date : SEP 07, 2023 – OCT 06, 2023 Planned Owner Notification Date : OCT 06, 2023 – OCT 06, 2023 * NR – Not Reported

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