Recall 21507 Unexpected Engine Shut Down – 2020-2023 IC Bus CE School Buses

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 03/02/2021 – Navistar Field service receives communication from a customer describing a vehicle stall.  03/09/2021 – Navistar Field Service and Compliance review the customer engine shut down condition and decide to monitor the condition.  03/15/2021 – Field Service initiates investigation into possible ECM faults related to the engine stall condition.  03/24/2021 – Navistar ships ECM to supplier for root cause analysis to determine failure behind multiple fault codes resulting in engine shut down.  04/01/2021 through 04/27/2021 – No reports of engine shut down related to the multiple fault codes condition.  04/28/2021 – Navistar receives root cause analysis of the ECM from PSI and their supplier Delphi. Delphi concluded the ECM was acceptable with no internal hardware failure, no solder failure, and ECM functionality was intact. Failure could not be duplicated.  05/13/2021 – Navistar and PSI perform additional quality inspections of the vehicle interface connector (VIC) to verify the engine harness pin connections were not the cause of the power surge resulting in the fault codes and shut down.  05/26/2021 – Navistar and PSI review data collected to date and determine fault 629/12 may be related to the engine stall condition.  06/10/2021 – Navistar and PSI develop a diagnostic plan for a vehicle that is experiencing fault 629/12 to narrow down the scope or identify root cause.  06/15/2021 through 09/10/2021 – A Control Tec Data logger was installed on a vehicle that previously experienced fault code 629/12 with engine shut down with no repair after the incident. The failure could not be duplicated with over 5,000 miles logged.  06/23/2021 – Navistar and PSI meet to discuss potential failures such as intermittent loss of power supply to ECM and/or EMI/CAN bus overload or corrosion at the pin terminal resulting in communication error.  06/28/2021 – Navistar and PSI meet to discuss inventory inspection performed at PSI manufacturing. There were no bent pins found in the VIC. Additionally, Borg Warner confirmed shut down was appropriate when fault code 629/12 is set.  07/16/2021 – Navistar and PSI review fault code 629/12 occurrence and related Warranty data resulting in ECM replacement for 629/12. A test strategy was developed to test VIC power interruption to ECM and/or pin connections.  07/17/2021 through 10/14/2021 – No reports of engine shut down resulting from fault code 629/12.  08/12/2021 – Navistar Compliance and Field Service meet to identify any additional failures since July 2021 and discuss progress to date of the Control Tec Data logger installed on suspect vehicle. There were no incidents of fault code 629/12 and engine shut down recorded. Data collection continues on this vehicle.  08/18/2021 – Navistar Compliance and Engineering meet internally to discuss potential issue with ECM programming software that may cause fault 629/12.  8/19/2021 – Navistar Compliance Committee meet to review failure mode, potential root cause, and fault code 629/12 occurrence. The Committee recommended to continue review of the ECM programming software and investigation of fault code 629/12 and reaction with supplier.  09/03/2021 – Navistar, PSI, and BorgWarner meet to discuss the functionality of the ECM and Fault code 629/12 and ECM sequence of fault reaction.  09/10/2021 – PSI and Borg Warner confirmed the sequence of fault code reaction was correct and determined to measure loop count from main micro to safety micro operation and maximum loop time of micro MPM software exchange.  09/14/2021 – PSI and Borg Warner confirmed measured loop count from main micro to safety micro was working properly and within program timing. Borg Warner confirms vehicle can restart after fault code 629/12 with a five second key off event before restart.  09/24/2021 – Navistar, PSI, and Borg Warner meet to discuss potential on-vehicle testing and bench testing of the ECM.  10/05/2021 – Tests interrupting the PT ignition were performed by Borg Warner and PSI. Borg Warner tests involved the use of a bench set-up with increased RPMs to simulate increase in CPU load. PSI performed the same increase in CPU load in their on-vehicle testing. Borg Warner and PSI were unable to reproduce the 629/12 shut down failure.  10/14/2021 – Navistar Compliance Committee meet to review the progress of the investigation causing fault code 629/12. Review the potential of main micro software delay/unsent message, software reacting to harness power interruption, and restart capability after vehicle shutdown caused by 629/12. Additional information for occurrence, time period of fault code 629/12, and vehicle build population was requested.  10/15/2021 – PSI and Borg Warner inspect four vehicles that experienced Fault code 629/12. One vehicle, the pins in the VIC inspected good and the failure could not be reproduced. The remaining three vehicles had a bent pin in the VIC connection and the failure could still not be reproduced.  10/19/2021 – Navistar reviewed the failure time periods. There was a total of 42 reports of fault code 629/12 occurring during the suspect date range. Not all of these reports could be confirmed as causing a vehicle shutdown. Based on these fault code reports Navistar declares a safety recall even though a cause could not be determined.

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A #AVISJ.IR COMPANY IC Bus, LLC 2701 Navistar Drive Lisle, IL 60532 USA navistar.com IMPORTANT SAFETY RECALL 21507 INTERIM NOTICE NHTSA RECALL NO. 21 V-837 This notice applies to your vehicle identified on the enclosed card. Dear IC Bus Customer, This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. IC Bus has decided that a defect which relates to motor vehicle safety exists ln certain 2020, 2021, 2022, and 2023 CE school bus models built 01/17/2019 thru 10/20/2021 with PSI 8.8L gasoline engines and 2020, 2021, 2022 and 2023 CE school bus models built 04/11/2019 thru 10/19/2021 with PSI 8.8L LPG engines. REASON FOR THIS RECALL With the vehicle in motion, the engine control module (ECM) may set a fault code resulting in engine shut down without warning. RISK TO MOTOR VEHICLE SAFETY In a bus application, unintended engine shut down without warning may r~sult in evacuation concerns when students must be transferred to another bus near the roadway. ACTIONS YOU SHOULD TAKE A final remedy for this defect has not been determined. You will be notified again when the final remedy is available. In the interim, IC Bus advises if engine shut down occurs while in motion, steer vehicle to a safe location and stop. Then turn the ignition to key off position, wait 5-seconds, and restart the engine. ~&□ Cb~@ NOV O 5 2021 By.• .C. . .o.,.#../.J..t. 1.1..4./.V “‘ •C•,•/•! . NOVEMBER 2021 If the engine is restarted and the STOP lamp remains illuminated, the vehicle should be diagnosed by a qualified technician to determine the root cause of the diagnostic trouble code (OTC). You can find your nearest dealer by calling 1-800-448-7825 or by using the dealer locator at http://www.icbus.com. If you are the lessor of this vehicle, please forward a copy of this notice to the lessee within ten days to comply with federal regulations. If you do not own this vehicle, please fill out and return mail the enclosed card so that you will not be contacted again about this recall. IF YOU NEED ASSISTANCE If you believe that IC Bus has failed to remedy the defect without charge or within a reasonable time, please follow the procedure described in the Owner Assistance Guide section in your Owner’s Manual or call toll free 1-800-448- 7825. IC Bus requests your prompt attention and patience regarding the correction of this defect and apologizes for any inconvenience this may cause you. IC Bus, LLC

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\.Q)~ u~u~ JAN 11 2022 SER OCEDURE SUBJECT: SAFETY RECALL 21507 JANUARY, 2022 ENGINE CONTROL MODULE (ECM) on certain 2020, 2021, 2022, and 2023 CE school bus models built 01/17/2019 thru 01/06/2022 with PSI 8.SL gasoline engines and 2020, 2021, 2022 and 2023 CE school bus models built 04/11/2019 thru 01/06/2022 with PSI 8.SL LPG engines CUSTOMER LETTER Print ready (PDF file) copy of the Customer Letter DEFECT DESCRIPTION With the vehicle in motion, the Engine Control Module (ECM) may set a fault code resulting in engine shut down without warning. In a bus application, unintended engine shut down without warning may result in evacuation concerns when students must be transferred to another bus near the roadway. MODELS INVOLVED This safety recall involves certain 2020, 2021, 2022, and 2023 CE school bus models built 01/17/2019 thru 01/06/2022 with PSI 8.8L gasoline engines and 2020, 2021, 2022 and 2023 CE school bus models built 04/11/2019 thru 01/06/2022 with PSI 8.8L LPG engines. ELIGIBILITY This procedure applies ONLY to vehicles marked in the International® Service Portal5M with Safety Recall 21507. Also complete any other open campaigns listed on the Service Portal at this time. PARTS INFORMATION There are no parts for this safety recall. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 1 TOOLS REQUIRED NOTE: Prior to performing this Recall, you must ensure your EZ-Tech® or equivalent Electronic Service Tool (EST) has PSI Powerlink Software installed. Description Tool Number Quantitv Powerlink Programming Cable 12-716-01 1 EZ-Tech® or Equivalent N/A 1 PSI ECU Field Programmer Software N/A 1 NEXIQ (USB- Link Series) N/A 1 Battery Charger 55 Amp PSC550CC 1 SERVICE PROCEDURE WARNING! To prevent personal injury and / or death, or damage to property, park vehicle on hard flat surface, turn the engine off, set the parking brake and install wheel chocks to prevent the vehicle from moving in either direction. WARNING! To prevent personal injury and / or death, always wear safe eye protection when performing vehicle maintenance. WARNING! To prevent personal injury and / or death, or damage to property, allow engine/ vehicle components to cool before servicing. WARNING! To prevent personal injury and / or death, or damage to property, keep flames or sparks away from vehicle and do not smoke while servicing the vehicle’s batteries. Batteries expel explosive gases. 1. Park vehicle on flat surface. 2. Shift transmission to Park or Neutral and set parking brake. 3. Turn vehicle ignition to Key OFF position. 4. Install wheel chocks. 5. Open battery compartment and connect battery charger to vehicle battery. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 2 1 6. Unlatch and open hood. 7. Obtain a health report from vehicle. 0000388338 Figure 1. Engine Harness – Proprietary Network Connector 1.Cap 8. Locate proprietary network connector located on the engine harness below Engine Control Module (ECM). Remove protective cap (Figure 1, Item 1 ) and save for reuse. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 3 1 0000388339 Figure 2. Powerlink Programming Cable – Under Hood 1. Connector 9. Using Powerlink programming cable, connect appropriate connector (Figure 2, Item 1) to proprietary network harness. 10. Route remainder of programming cable into vehicle interior. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 4 1 1 0000388340 Figure 3. Data Link Connector (DLC) – Under Dash 1. DLC 11. Locate DLC (Figure 3, Item 1) under vehicle dash. 0000388341 Figure 4. Powerlink Programming Cable – Under Dash 1. Connector 12. Connect 6-pin connector of programming cable (Figure 4, Item 1) to DLC. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 5 1 2 0000466403 Figure 5. Powerlink Programming Cable- USB Interface 1. Connector 2. Laptop / USB interface connector NOTE: Ensure laptop screen saver and sleep settings are turned OFF or set to a minimum of one hour. 13. Connect programming cable (Figure 5, Item 1) to laptop / USB interface connector (Figure 5, Item 2). 14. Turn vehicle ignition to Key ON, Engine OFF. NOTE: Refer to PSI Product Bulletin PSl220001 at the end of this document for calibration and programming information. 15. Using EZ-Tech® or equivalent Electronic Service Tool (EST) with PSI Powerlink Software installed, program ECM. Refer to attached PSI Bulletin PSl220001 for additional information. 16. Turn vehicle ignition to Key OFF position. 17. Disconnect EST from DLC and underhood proprietary network connector. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 6 18. Install protective cap to proprietary network connector. 19. Close and latch hood. 20. Disconnect battery charger from vehicle battery and close compartment. 21. Remove wheel chocks. END OF SERVICE PROCEDURE LABOR INFORMATION Operation Number Description A40-21507-1 Connect to vehicle and recalibrate ECU CAMPAIGN IDENTIFICATION LABEL Each vehicle corrected in accordance with this campaign must be marked with a CTS-1075 Campaign Identification Label. Complete the label and attach on a clean surface next to the vehicle identification number (VIN) plate. ADMINISTRATIVE / DEALER RESPONSIBILITIES WARRANTY CLAIMS Time 0.4 hr COMPLElED Service Location Code ‘ Warranty claim expense is to be charged to Warranty. Claims are to be submitted in the normal manner, making reference to Safety Recall 21507. Section 7 of the Warranty Policy and Procedures Manual contains further information related to the submission and processing of AFC / Recall claims. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 7 As with all claim submissions, items acquired locally must be submitted in the “Other Charges” tab. The cost of any bulk items (such as a bag of cable tie straps, roll of wire, barrel of oil, or tube of silicone) should be prorated for the cost of the individual pieces / amount used during each repair. GROUP GROUP – Enter n NOUN – Leave b umber lank ~ ~ I – C (CAUSE) – Enter either 1, 2, 3. (See below) 1. Inspected (No repair required). 2. Inspected and repaired. 3. Defective part from parts stock. – arranty Code) Enter 40. ~ I WARRANTY – (W TYPE PART – En PAD – Enter ’00 ter P for type part causing failure. – UNITED STATES AND POSSESSIONS I -~ NOUN C WARR. TP PAD I I I I The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle that is subject to a vehicle recall campaign must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to adequately repair within 60 days after a tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within 60 days, the owner may be entitled to replacement with an identical or reasonable equivalent vehicle at no charge, or to a refund of the purchase price less a reasonable allowance for depreciation. Dealers must correct all vehicles subject to this campaign at no charge to the owner, regardless of mileage, age of vehicle, or ownership, from this time forward. Dealers should proceed immediately to make necessary correction to units in inventory. All inventory vehicles subject to this recall campaign must be corrected prior to sale, transfer or delivery. If vehicles have been sold or transferred and you are in receipt of Customer Notification Letters and Authorization for Recall Service cards for those vehicles, the transfer location or customer must be notified immediately from your dealer location. Dealers must make every effort to promptly schedule an appointment with each owner to repair his or her vehicle as soon as possible. However, consistent with the customer notification, dealers are expected to complete the repairs on the mutually agreed upon service date. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 8 Dealers involved in the recall process will be furnished a listing of owner names and addresses to enable them to follow up with owners and have the vehicles corrected. Use of this listing must be limited to this campaign because the list may contain information obtained from state motor vehicle registration records, and the use of such motor vehicle registration data for purposes other than this campaign is a violation of law in several states. CANADA Dealers must correct all vehicles subject to this campaign at no charge to the owner, regardless of mileage, age of vehicle, or ownership, from this time forward. Dealers should proceed immediately to make necessary correction to units in inventory. All inventory vehicles subject to this recall campaign must be corrected prior to sale, transfer or delivery. If vehicles have been sold or transferred and you are in receipt of Customer Notification Letters and Authorization for Recall Service cards for those vehicles, the transfer location or customer must be notified immediately from your dealer location. Dealers must make every effort to promptly schedule an appointment with each owner to repair his or her vehicle as soon as possible. However, consistent with the customer notification, dealers are expected to complete the repairs on the mutually agreed upon service date. Dealers involved in the recall process will be furnished a listing of owner names and addresses to enable them to follow up with owners and have the vehicles corrected. Use of this listing must be limited to this campaign because the list may contain information obtained from state motor vehicle registration records, and the use of such motor vehicle registration data for purposes other than this campaign is a violation of law in several states. EXPORT Export Distributors should proceed immediately to make necessary correction to units in inventory. All inventory vehicles subject to this recall campaign must be corrected prior to sale, transfer or delivery. If vehicles have been sold or transferred and you are in receipt of Customer Notification Letters and Authorization for Recall Service cards for those vehicles, the transfer location or customer must be notified immediately from your distributor location. Export Distributors are to submit warranty claims in the usual manner making reference to this recall number. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reseived. All marks are trademarks of their respective owners. 9 Export Distributors are expected to provide full cooperation and follow-up with respect to this important subject matter. If you have any questions or need further assistance, please contact the Regional Service Manager at your regional office. NAVISTAR, INC. VEHICLE RECALL 21507 © 2022 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 10 – PRODUCT BULLETIN – 1 Bulletin Number Title . Date of Notice Engine Displacement Description General Information I PSl220001 t I Navistar 8.8L OBDHD Gasoline and Gen ti Propane Calibration Update 01/05/2022 j 8.8L At the request of Navistar, Power Solutions International, Inc. (“PSI”) has released updated calibrations for MY19, M20, and MY21 8.8L Gasoline and 8.8L Propane engines. The details and summary of the updates along with warranty eligibility are described below. The calibration updates shown below change the reporting and reactions to SOH faults and prevents a forced shutdown reaction when a SOH fault sets. If the ECM detects the fault once, the ECM will power cycle itself and the MIL will turn on and the vehicle will continue to operate normally. If the fault happens a second time within the same key-cycle, the engine will go into “Forced Limited Power” and the dash will be beeping with the stop sign illuminated on the dash. The vehicle will still be drivable in this situation. Calibration Information The calibration shown in yellow on the following tables are the newest release calibrations as of the date of this publication. Below gasoline calibrations will receive MV22 gasoline calibration: 38300107-2. TABLE 1 MY22 GASOLINE CALIBRATION: 38300107-2 Product Replaces Old Calibration MY19 GAS 38300064-1 MY19 GAS 38300064-2 MY20GAS 38300081-1 MY20GAS 38300081-2 MY21 GAS 38300090-1 IF YOU HAVE ANY QUESTIONS ABOUT THIS NOTICE PLEASE CONTACT THE POWER SOLUTIONS INC. SERVICE DEPARTMENT@ 1-888-331-5764. OR J Below LPG Gen2 calibrations will receive the MY22 LPG Gen2 calibration: 38300108-2. TABLE2 MY22 LPG Gen2 calibration: 38300108-2 Product Replaces Old CaUbratlon MY19 LPG 38300037-1 MY19 LPG 38300037-2 MY19 LPG 38300037-3 MY19 LPG 38300037-4 MY19 LPG 38300037-5 MY20 LPG 38300080-1 MY20 LPG 38300080-2 MY21 LPG 38300089-1 Below LPGULN calibrations will receive the MY22 LPGULN calibration: 38300109-2. TABLE 3 MY22 LPGULN calibration: 38300109-2 Product Replaces Old Calibration MY20 LPGULN 38300088-1 MY20 LPGULN 38300088-2 MY21 LPGULN 38300102-1 How to update the ECM calibration? The ECM calibration is updated using the PSI Powerlink electronic service tool. Follow the steps provided in the PSI Powerlink user manual shown on page 46 “Calibration Programming”. Link to download PSI Powerlink User Guide Warranty Eligibility ECM calibration updates shown on this publication are not eligible for warranty reimbursement from PSI. IF YOU HAVE ANY QUESTIONS ABOUT THIS NOTICE PLEASE CONTA~Y’ THE ‘Pa°WER· ~~- . : . . . . . . ” rJ., ~ soLur,oNs 1Nc. srnv1cE DEPARTMENT@ ..:.mI)tr’-\tL~~ I.. _-_ • .., .. ~~ 1-888-331-5764. ,,·. 1 1i ~~ _ _ – — _z.. = = ·”‘ !1 _ ,:_i

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IC Bus, LLC 2701 Navistar Drive Lisle, IL 60532 USA navistar.com ~&D 0:::i[]g [ID JAN l 8 2022 • C. tfJ.M I’ L. ,, Aμ C E.. By . …………… ……. .. A N.ll’ISZIR COMPANY IMPORTANT SAFETY RECALL 21507 NHTSA RECALL NO. 21V-837 This notice applies to your vehicle identified on the enclosed card. Dear IC Bus Customer, This notice is sent to you in accordance w~h the requirements of the National Traffic and Motor Vehicle Safety Act. IC Bus has decided that a defect which relates to motor vehicle safety exists in certain 2020, 2021, 2022, and 2023 CE school bus models built 01/17/2019 thru 01/06/2022 with PSI 8.8L gasoline engines and 2020, 2021, 2022 and 2023 CE school bus models built 04/1 1/2019 thru 01/06/2022 with PSI 8.8L LPG engines. REASON FOR THIS RECALL With the vehicle in motion, the Engine Control Module (ECM) may set a fault code resulting in engine shut down without warning, increasing the risk of a crash. RISK TO MOTOR VEHICLE SAFETY In a bus application, unintended engine shut down without warning may result in evacuation concerns when students must be transferred to another bus near the roadway, increasing the risk of injury. DEFECT REMEDY The repair will involve recalibration of the ECM. Dealers have software and instructions to repair your vehicle. The repair will be performed free of charge and take approximately 45 minutes to complete. ACTIONS YOU SHOULD TAKE If you own this vehicle, please schedule an appointment with any IC Bus dealer to have your vehicle repaired. You can find your nearest dealer by calling 1-800-448-7825 or by using the dealer locator at http:f/www.icbus.com. JANUARY 2022 If you have already paid for repairs prior to this notice that corrected the defect, you may be eligible for reimbursement of certain repair expenses if they occurred 10126/2020 thru 01/28/2022. Present your original repair paperwork and proof of payment to any IC Bus dealer and your eligibility wMI be reviewed. You may also submit a claim using the enclosed Request for Reimbursement card. If you are the lessor of this vehicle, please forward a copy of this notice to the lessee within ten days to comply with federal regulations. If you do not own this vehicle, please fill out and return mail the enclosed card so that you will not be contacted again about this recall. IF YOU NEED ASSISTANCE If you believe that IC Bus has failed to remedy the defect without charge or within a reasonable time, please follow the procedure described in the Owner Assistance Guide section in your Owner’s Manual or call toll free 1-800-448- 7825. You may also submit a complaint to the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Ave, SE, Washington, DC 20590; or call the toll free Vehicle Safety Hotline at 1-888-327-4236 (TTY: 1-800- 424-9153): or go to http:f/www.safercar.gov. IC Bus requests your prompt attention and patience regarding the correction of this defect and apologizes for any inconvenience this may cause you. IC Bus, LLC

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