22528 Loose Fasteners May Cause Rear Axle Instability – 2023 IC Bus CE & International RE Commercial Buses

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-910 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Navistar, Inc. Submission Date : DEC 08, 2022 NHTSA Recall No. : 22V-910 Manufacturer Recall No. : 22528 Manufacturer Information : Manufacturer Name : Navistar, Inc. Address : 2701 Navistar Drive Lisle IL 60532 Company phone : 331-332-1590 Population : Number of potentially involved : 46 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 IC CE commercial Bus Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models equipped with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS). • The inclusive dates of manufacture were determined by warranty data / first failure build date and when the issue was contained in manufacturing. • The vehicles in the suspect population were built at a certain assembly plant where all vehicles not subject to this recall were built at other manufacturing plants. There are six CE commercial buses in the suspect population Production Dates : FEB 14, 2022 – SEP 13, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2023-2023 IN RE commercial buses Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models equipped with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS). • The inclusive dates of manufacture were determined by warranty data / first failure build date and when the issue was contained in manufacturing. • The vehicles in the suspect population were built at a certain assembly plant where all vehicles not subject to this recall were built at other manufacturing plants. There are 40 RE commercial buses in the suspect population Production Dates : MAY 12, 2022 – NOV 15, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-910 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : The fasteners of the transverse torque arm to the rear axle housing may not have been tightened to their specified value at time of assembly. Over time, they may become loose or separate, resulting in the rear axle to shift from side to side. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : In a bus application, a rear axle that shifts from side to side can cause reduced handling performance and may result in evacuation concerns when passengers must be transferred to another bus near the roadway. Description of the Cause : The tool used to assemble the transverse torque rod to the rear axle housing incorrectly gave the operator an indication it had reached the correct torque value when it did not. Identification of Any Warning that can Occur : A general “loose” feeling when driving, possible metallic clunking noise in the rear of the vehicle or during pre/post trip inspections the rear axle does not appear centered to the bus body. Involved Components : Component Name 1 : NR Component Description : NR Component Part Number : NR Supplier Identification : Component Manufacturer Name : N/A – Manufacturing issue Address : NR NR Country : NR Chronology : • 08/05/2022 – Navistar Field Service reviews field reports of four units with loose transverse torque rod axle side bolts on units in service less than three months. • 08/10/2022 – Navistar’s Tulsa bus plant inspected 10 units built in March and all were found in specification. Additionally, the tool and process for the transverse torque rod to Part 573 Safety Recall Report 22V-910 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 axle joint were inspected with no issues found. • 08/11/2022 through 09/22/2022 – Nine more units were found with loose of missing axle side fasteners. • 09/22/2022 – Navistar Field Service received communication of three more units with axle side fasteners missing on units in service for less than three months. • 09/26/2022 – IC Bus dealer inspected 90 units at one location. All but 5 had their fasteners retightened to their specified value. • 10/31/2022 – IC Bus dealer reinspected 10 of the fleet; four units found with bolts loose a second time. These fasteners were replaced and sent to Navistar engineering for analysis. • 11/11/2022 – Navistar completes the part analysis for material hardness and found no deficiencies. • 11/16/2022 – Navistar contains the issue in manufacturing by instituting a secondary torque top-off operation. • 11/22/2022 – Navistar finalizes the suspect population. • 12/01/2022 – Navistar declares a Safety Recall. Description of Remedy : Description of Remedy Program : • The remedy will involve replacing the transverse torque rod to axle fasteners and tightening them to their specified value. • Navistar’s plan for reimbursement of pre-notification remedies, on file with NHTSA and dated 05/06/2022, applies and reimbursement instructions will be included in the customer notification. How Remedy Component Differs from Recalled Component : The remedy will involve replacing the fasteners and tightening them to their assembly value where the recalled fasteners were not tightened to their specified value. Identify How/When Recall Condition was Corrected in Production : 11/16/2022 – Navistar manufacturing adds the use of a top-off torque wrench and witness mark to the joint’s fasteners. Recall Schedule : Description of Recall Schedule : It is estimated that the Customer and Dealer notification letters will be mailed by 02/06/2023. Planned Dealer Notification Date : FEB 06, 2023 – FEB 06, 2023 Planned Owner Notification Date : FEB 06, 2023 – FEB 06, 2023 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-910 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Navistar, Inc. Submission Date : DEC 13, 2022 NHTSA Recall No. : 22V-910 Manufacturer Recall No. : 22528 Manufacturer Information : Manufacturer Name : Navistar, Inc. Address : 2701 Navistar Drive Lisle IL 60532 Company phone : 331-332-1590 Population : Number of potentially involved : 46 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 IC CE commercial Bus Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models equipped with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS). • The inclusive dates of manufacture were determined by warranty data / first failure build date and when the issue was contained in manufacturing. • The vehicles in the suspect population were built at a certain assembly plant where all vehicles not subject to this recall were built at other manufacturing plants. There are six CE commercial buses in the suspect population Production Dates : FEB 14, 2022 – SEP 13, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2023-2023 IN RE commercial buses Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models equipped with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS). • The inclusive dates of manufacture were determined by warranty data / first failure build date and when the issue was contained in manufacturing. • The vehicles in the suspect population were built at a certain assembly plant where all vehicles not subject to this recall were built at other manufacturing plants. There are 40 RE commercial buses in the suspect population Production Dates : MAY 12, 2022 – NOV 15, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-910 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : The fasteners of the transverse torque arm to the rear axle housing may not have been tightened to their specified value at time of assembly. Over time, they may become loose or separate, resulting in the rear axle to shift from side to side. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : In a bus application, a rear axle that shifts from side to side can cause reduced handling performance and may result in an increased risk of injury if passengers must be transferred to another bus near the roadway. Description of the Cause : The tool used to assemble the transverse torque rod to the rear axle housing incorrectly gave the operator an indication it had reached the correct torque value when it did not. Identification of Any Warning that can Occur : A general “loose” feeling when driving, possible metallic clunking noise in the rear of the vehicle or during pre/post trip inspections the rear axle does not appear centered to the bus body. Involved Components : Component Name 1 : Bolt and Hex Nut Component Description : Bolt and Hex Nut Component Part Number : 31077R1 (BOLT) / 30756R1 (Nut Hex) Supplier Identification : Component Manufacturer Name : N/A – Manufacturing issue Address : NR NR Country : NR Chronology : • 08/05/2022 – Navistar Field Service reviews field reports of four units with loose transverse torque rod axle side bolts on units in service less than three months. • 08/10/2022 – Navistar’s Tulsa bus plant inspected 10 units built in March and all were found in specification. Additionally, the tool and process for the transverse torque rod to Part 573 Safety Recall Report 22V-910 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 axle joint were inspected with no issues found. • 08/11/2022 through 09/22/2022 – Nine more units were found with loose of missing axle side fasteners. • 09/22/2022 – Navistar Field Service received communication of three more units with axle side fasteners missing on units in service for less than three months. • 09/26/2022 – IC Bus dealer inspected 90 units at one location. All but 5 had their fasteners retightened to their specified value. • 10/31/2022 – IC Bus dealer reinspected 10 of the fleet; four units found with bolts loose a second time. These fasteners were replaced and sent to Navistar engineering for analysis. • 11/11/2022 – Navistar completes the part analysis for material hardness and found no deficiencies. • 11/16/2022 – Navistar contains the issue in manufacturing by instituting a secondary torque top-off operation. • 11/22/2022 – Navistar finalizes the suspect population. • 12/01/2022 – Navistar declares a Safety Recall. Description of Remedy : Description of Remedy Program : • The remedy will involve replacing the transverse torque rod to axle fasteners and tightening them to their specified value. • Navistar’s plan for reimbursement of pre-notification remedies, on file with NHTSA and dated 05/06/2022, applies and reimbursement instructions will be included in the customer notification. How Remedy Component Differs from Recalled Component : The remedy will involve replacing the fasteners and tightening them to their assembly value where the recalled fasteners were not tightened to their specified value. Identify How/When Recall Condition was Corrected in Production : 11/16/2022 – Navistar manufacturing adds the use of a top-off torque wrench and witness mark to the joint’s fasteners. Recall Schedule : Description of Recall Schedule : It is estimated that the Customer and Dealer notification letters will be mailed by 02/06/2023. Planned Dealer Notification Date : FEB 06, 2023 – FEB 06, 2023 Planned Owner Notification Date : FEB 06, 2023 – FEB 06, 2023 * NR – Not Reported

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SERVICE PROCEDURE SUBJECT: @~ □@□@ FEB O I 2023 Compliance Dept 22528 FEBRUARY, 2023 SAFETY RECALL Transverse Torque Rod Fasteners on certain 2023 IC Bus® CE and RE commercial bus models built 02/07/2022 thru 11/15/2022 with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS) CUSTOMER LETTER Print ready (PDF file) copy of the Customer Letter DEFECT DESCRIPTION The fasteners of the transverse torque arm to the rear axle housing may not have been tightened to their specified value at time of assembly. Over time, they may become loose or separate, resulting in the rear axle shifting from side to side. In a bus application, a rear axle that shifts from side to side can cause reduced handling performance and may result in an increased risk of injury if passengers must be transferred to another bus near the roadway. MODELS INVOLVED This safety recall involves certain 2023 IC Bus® CE and RE commercial bus models built 02/07/2022 thru 11/15/2022 with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS). ELIGIBILITY This procedure applies ONLY to vehicles marked in the International® Service Portal™ with Safety Recall 22528. Also complete any other open campaigns listed on the Service Portal at this time. VEHICLE RECALL 22528 @ 2023 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 1 PARTS INFORMATION Part Number Part Descri tion Quantit 8900326R91 Kit; IROS Fasteners 1 8900326R91 contains the following parts: Part Description Quantity Bolt 2 Hex Lock Nut 2 SERVICE PROCEDURE WARNING! To prevent personal mJury 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 I or death, or damage to property, if the vehicle must be raised, do not work under the vehicle supported only by jacks. Jacks can slip or fall over. 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, 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. VEHICLE RECALL 22528 © 2023 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 2 1 2 0000476713 Figure 1. Transverse Torque Rod Axle 1. Transverse torque rod axle side bolt (2) 2. Transverse torque rod axle side nut (2, 1 not shown) 5. Remove bolts (Figure 1, Item 1) and nuts (Figure 1, Item 2) that fasten transverse torque rod to axle. Discard bolts and nuts. 6. Install new bolts (Figure 1, Item 1) and nuts (Figure 1, Item 2) that secure transverse torque rod to axle. 7. Tighten nuts to 217-239 lb-ft (294-325 N•m). 8. Remove wheel chocks. END OF SERVICE PROCEDURE LABOR INFORMATION Operation Number Description Time A40-22528-1 Replace Torque Rod Bolts 0.5 hrs VEHICLE RECALL 22528 © 2023 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 3 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 COMPLETED Service LocaUon Codi ‘ Warranty claim expense is to be charged to Warranty. Claims are to be submitted in the normal manner, making reference to Safety Recall 22528. Section 7 of the Warranty Policy and Procedures Manual contains further information related to the submission and processing of AFC / Recall claims. 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 nu mber NOUN – Leave b lank ,: ..,.._ I – C (CAUSE) – Ente r either 1, 2, 3. (See below) 1. tnspected 2, Inspected 3. Defective p (No repair required). and repaired. art from parts stock. – arranty Code) Enter 40. ~ I WARRANTY – (W TYPE PART – En PAD – Enter 1)() ter P for type part causing failure. ~ ~ VEHICLE RECALL 22528 I — NOUN C WARR. TP PAD I I I I 00000,4 7910 @ 2023 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 4 UNITED STATES AND POSSESSIONS 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 vel:licles 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. 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. VEHICLE RECALL 22528 © 2023 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 5 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. 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 22528 © 2023 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners. 6

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IC Bus,LLC 2701 Navistar Drive Lisle. IL 60532 USA ~£0[1=.~@ FEB O 6 2023 navistar.com By: q_q!.fff-.,_·tf1!f.~ . A M.IVISZIR COMPANY IMPORTANT SAFETY RECALL 22528 NHTSA RECALL NO. 22V-910 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 Vehlcle Safety Act. IC Bus has decided that a defect which relates to motor vehicle safety exists in certain 2023 CE and RE commercial bus models buitt 02/07/2022 thru 11/15/2022 with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS). REASON FOR THIS RECALL The fasteners of the transverse torque arm to the rear axle housing may not have been tightened to their specified value at time of assembly. Over time, they may become loose or separate, resulting in the rear axle shifting from side to side. RISK TO MOTOR VEHICLE SAFETY In a bus application, a rear axle that shifts from side to side can cause reduced handling performance and may result in an increased risk of injury if passengers must be transferred to another bus near the roadway. DEFECT REMEDY The repair will involve replacement of the transvers torque arm fasteners and tightening them to their specified value. Authorized repair locations have parts 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 using the dealer locator at htt1t://www.icbus1ccom or by calling 1-800-448-7825. FEBRUARY 2023 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 12/08/2021 thru 02/16/2023. Present your original repair paperwork and proof of payment to any IC Bus dealer and your eligibility will 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://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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