Electrical Short Circuit May Cause Engine Stall – 2023 IC Bus CE School Buses

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Cummins Inc. Box 3005 Columbus, IN 47202 – 3005 USA Mail Code: 40911 Phone: 1 800 CUMMINS care cummins.com *** IMPORTANT SAFETY RECALL*** NHTSA Recall No. 22E-063 Cummins Campaign #C2614 September 26, 2022 Dear Cummins Customer: This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Cummins Inc. has decided that a defect which relates to motor vehicle safety exists in certain Cummins B6.7, L9, X12 and X15 engines that were manufactured between May 13, 2022 and June 28, 2022. This notice applies to the engine(s) listed on the enclosed table. WHAT IS THE PROBLEM? Your engine is equipped with an Engine Control Module (ECM) that may have a manufacturing defect that could result in an engine stall without warning. An unexpected engine stall without the ability to restart the engine may lead to an increased risk of a crash. WHAT ARE WE DOING ABOUT THE PROBLEM? Cummins has released Safety Campaign #C2614 CM2450 ECM Replacement Safety Campaign to address this condition by replacing the ECM. This campaign is currently available at Cummins Distributors and authorized Warranty Dealers. The repair will be completed free of charge and most applications will require approximately 1.3 hours to complete. WHAT SHOULD YOU DO? Contact the nearest Cummins Distributor or authorized Warranty Dealer to arrange to have this safety action performed on your engine(s). The distributor or dealer will work with you to schedule the best date to complete this repair. If you have not registered your Cummins product, please complete the enclosed registration card or register your product at https://prodreg.cummins.com/prodreg/#/webform/contactInfo. If you are no longer the owner of the engine(s) listed on the enclosed table, please forward this notice to the new owner or provide the new owner’s contact information to Cummins so that we can notify them of this recall. Federal law requires vehicle lessors receiving this recall notice to forward a copy of this notice to the lessee within ten (10) days. Also, it is a violation of Federal law for a dealer to deliver a new vehicle or equipment covered by this recall notice under a sale or lease until the defect has been remedied. Cummins Inc. Box 3005 Columbus, IN 47202 – 3005 USA Mail Code: 40911 Phone: 1 800 CUMMINS care cummins.com *** IMPORTANT SAFETY RECALL*** NHTSA Recall No. 22E-063 Cummins Campaign #C2614 If you previously paid to have this recall performed on your vehicle, you may be eligible for reimbursement. Please contact Cummins Care at the number below for more information. WHO SHOULD YOU CONTACT IF YOU HAVE FURTHER QUESTIONS OR CONCERNS? If you have questions or concerns about this recall, please contact your local Cummins Distributor or authorized warranty dealer. You may also contact Cummins Care at 1-800-CUMMINS (1-800- 286-6467), or visit our website at care.cummins.com. If you have a complaint relative to this recall, you may report it to the following: Administrator National Highway Traffic Safety Administration 1200 New Jersey Avenue, SE Washington, DC 20590 You may also call the toll-free Vehicle Safety Hotline at 1-888-327-4236 (TTY: 1-800-424-9153); or go to http://www.safercar.gov. Cummins is taking this action in the interest of your safety and satisfaction with our products. We apologize for any inconvenience and thank you for your attention to this matter. Sincerely, Campaign Administrator Cummins Inc.

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-610 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Navistar, Inc. Submission Date : MAR 29, 2023 NHTSA Recall No. : 22V-610 Manufacturer Recall No. : None Manufacturer Information : Manufacturer Name : Navistar, Inc. Address : 2701 Navistar Drive Lisle IL 60532 Company phone : 331-332-1590 Population : Number of potentially involved : 33 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 IC CE School bus Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models equipped with Cummins B6.7 or L9 engines with suspect Engine Control Modules (ECMs). • The inclusive dates of manufacture were determined by Cummins Engine Serial Numbers (ESNs) built with suspect ESNs and the respective build dates of the vehicles they were installed into. • The vehicles in the suspect population were built with suspect Cummins engine ESNs and all other vehicles not subject to this recall were not built with suspect Cummins engine ESNs. There are 33 CE school buses in the suspect population Production Dates : JUN 01, 2022 – JUN 27, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : As per Cummins in 22E-063; ECMs within the subject population that are affected by the defect condition may develop an internal electrical short circuit, possibly resulting in an engine stall without warning. If this occurs, the engine cannot be restarted until replacement of the ECM and, if necessary, the fuse. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : As per Cummins in 22E-063; an unexpected engine stall without the ability to restart the engine may lead to an increased risk of a crash. Description of the Cause : As per Cummins in 22E-063; a screw in the supplier’s selective solder fixture backed out of position, pushing an electrolytic capacitor frame into the Printed Circuit Board (PCB) during ECM production. Part 573 Safety Recall Report 22V-610 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : None Involved Components : Component Name 1 : Diesel Engine Component Description : Medium duty diesel engines Component Part Number : Models B6.7 and L9 Supplier Identification : Component Manufacturer Name : Cummins, Inc. (Cummins) Address : 500 Jackson Street Columbus Indiana 47202 Country : United States Chronology : • 06/30/2022 – Navistar receives communication of the issue from Cummins and that they have begun containment actions. • 07/06/2022 – Navistar manufacturing places a stop ship into effect for all vehicles built with Cummins engines at all vehicle assembly plants. • 07/13/2022 – Cummins communicates to Navistar their plan for replacing suspect ECMs. • 07/20/2022 – Cummins begins replacing suspect ECMs on vehicles at Navistar vehicle assembly plants and this activity will continue until all quarantined vehicles have been repaired. • 07/21/2022 – Cummins Product Safety Board determines a Safety Recall and advises all affected vehicle OEMs. • 07/29/2022 – Cummins provides a copy of their 573 to Navistar. • 08/01/2022 – Cummins provides a list of affected vehicles to Navistar. • 08/04/2022 – Navistar declares a Safety Recall to be managed by Cummins under NHTSA recall 22E-063. Part 573 Safety Recall Report 22V-610 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : • Cummins will administer the campaign (Replace ECMs), notify customers, supply remedy, and provide quarterly completion reports as outlined in Cummins defect report for 22E-063. • Because Cummins is administering the campaign, any plan for preremedy reimbursement will be handled by Cummins. How Remedy Component Differs from Recalled Component : Unknown as Cummins has not provided an update providing this information. As Per Cummins 22E-063; the remedy ECMs will have different Serial Numbers than the recalled ECMs. Identify How/When Recall Condition was Corrected in Production : As per Cummins 22E-036; The ECM supplier corrected the ECM production assembly process on June 2, 2022. Cummins initiated containment actions at impacted engine plants on June 28, 2022. Recall Schedule : Description of Recall Schedule : • Navistar will supply Cummins with customer name and address information. Cummins anticipates mailing 577 notification to affected customers by 09/26/2022. • Cummins anticipates sending dealer notification by 09/26/2022. Planned Dealer Notification Date : SEP 26, 2022 – SEP 26, 2022 Planned Owner Notification Date : SEP 26, 2022 – SEP 26, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-610 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Navistar, Inc. Submission Date : AUG 10, 2022 NHTSA Recall No. : 22V-610 Manufacturer Recall No. : None Manufacturer Information : Manufacturer Name : Navistar, Inc. Address : 2701 Navistar Drive Lisle IL 60532 Company phone : 331-332-1590 Population : Number of potentially involved : 33 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 IC CE School bus Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models equipped with Cummins B6.7 or L9 engines with suspect Engine Control Modules (ECMs). • The inclusive dates of manufacture were determined by Cummins Engine Serial Numbers (ESNs) built with suspect ESNs and the respective build dates of the vehicles they were installed into. • The vehicles in the suspect population were built with suspect Cummins engine ESNs and all other vehicles not subject to this recall were not built with suspect Cummins engine ESNs. There are 33 CE school buses in the suspect population Production Dates : JUN 01, 2022 – JUN 27, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : As per Cummins in 22E-063; ECMs within the subject population that are affected by the defect condition may develop an internal electrical short circuit, possibly resulting in an engine stall without warning. If this occurs, the engine cannot be restarted until replacement of the ECM and, if necessary, the fuse. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : As per Cummins in 22E-063; an unexpected engine stall without the ability to restart the engine may lead to an increased risk of a crash. Description of the Cause : As per Cummins in 22E-063; a screw in the supplier’s selective solder fixture backed out of position, pushing an electrolytic capacitor frame into the Printed Circuit Board (PCB) during ECM production. Part 573 Safety Recall Report 22V-610 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : None Involved Components : Component Name 1 : Diesel Engine Component Description : Medium duty diesel engines Component Part Number : Models B6.7 and L9 Supplier Identification : Component Manufacturer Name : Cummins, Inc. (Cummins) Address : 500 Jackson Street Columbus Indiana 47202 Country : United States Chronology : • 06/30/2022 – Navistar receives communication of the issue from Cummins and that they have begun containment actions. • 07/06/2022 – Navistar manufacturing places a stop ship into effect for all vehicles built with Cummins engines at all vehicle assembly plants. • 07/13/2022 – Cummins communicates to Navistar their plan for replacing suspect ECMs. • 07/20/2022 – Cummins begins replacing suspect ECMs on vehicles at Navistar vehicle assembly plants and this activity will continue until all quarantined vehicles have been repaired. • 07/21/2022 – Cummins Product Safety Board determines a Safety Recall and advises all affected vehicle OEMs. • 07/29/2022 – Cummins provides a copy of their 573 to Navistar. • 08/01/2022 – Cummins provides a list of affected vehicles to Navistar. • 08/04/2022 – Navistar declares a Safety Recall to be managed by Cummins under NHTSA recall 22E-063. Part 573 Safety Recall Report 22V-610 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : • Cummins will administer the campaign, notify customers, supply remedy, and provide quarterly completion reports as outlined in Cummins defect report for 22E-063. • Because Cummins is administering the campaign, any plan for preremedy reimbursement will be handled by Cummins. How Remedy Component Differs from Recalled Component : Unknown as Cummins has not provided an update providing this information. Identify How/When Recall Condition was Corrected in Production : As per Cummins 22E-036; The ECM supplier corrected the ECM production assembly process on June 2, 2022. Cummins initiated containment actions at impacted engine plants on June 28, 2022. Recall Schedule : Description of Recall Schedule : • Navistar will supply Cummins with customer name and address information. Cummins anticipates mailing 577 notification to affected customers by 09/26/2022. • Cummins anticipates sending dealer notification by 09/26/2022. Planned Dealer Notification Date : SEP 26, 2022 – SEP 26, 2022 Planned Owner Notification Date : SEP 26, 2022 – SEP 26, 2022 * NR – Not Reported

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