23E025 Vehicle May Reverse Faster Than Expected – Cummins PowerDrive 7000 Electric Drive System

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*** IMPORTANT SAFETY RECALL *** NHTSA Recall No. 23E025 March 28, 2023 Blue Bird Corporation 3920 Arkwright Road, Suite 200 Macon, GA 31210 Dear Cummins OEM Customer: We are writing to inform you that Cummins Inc. has determined that a safety-related defect exists in certain PowerDrive 7000 BES CM0904 EV104B electric drivetrain systems that were manufactured between June 1, 2018, and October 30, 2021. Cummins has initiated a recall of the subject drivetrain System Control Modules. Our records indicate that some of these components were shipped to you. A copy of Cummins’ initial Part 573 Defect Notification report is enclosed. This notification was submitted to the National Highway Traffic Safety Administration (NHTSA) on March 27, 2023. As described in the Defect Notification, the System Control Module may activate the anti-rollback feature, causing the vehicle to move backwards uphill at a rate that may exceed certain drivers’ expectations. This may occur once the driver releases the brake while the vehicle is in reverse and pointing downhill on a grade greater than approximately 7%, possibly increasing the risk of a crash. Enclosed is a list of serial numbers for affected drivetrains that our records indicate were shipped to your plants. For drivetrains installed in vehicles that have left your control, we encourage you to make a safety defect determination in accordance with 49 USC 30118 et seq. and, as appropriate, to submit a Defect Notification to NHTSA in accordance with 49 CFR Part 573. Cummins will conduct the recall, including notifying owners pursuant to 49 CFR Part 577, performing the remedy, and submitting quarterly status reports to NHTSA. Cummins is requesting that you provide the associated vehicle model identification, VINs and owner contact information to facilitate owner notification. Please work with your Cummins account team leader to ensure that the requested information is provided to Cummins as soon as possible. As an equipment manufacturer, Cummins has no obligation to file a defect notification to Transport Canada for this recall. If an OEM has an obligation to report the defect to Transport Canada, we ask that you please provide the Transport Canada recall number for your vehicle recall to Cummins. Cummins cannot mail owner letters compliant with Transport Canada regulations without the recall number assigned by Transport Canada. Cummins will provide information to the OEM after mailings are completed so that the OEM can submit the required reports to Transport Canada. For drivetrains/vehicles that are still in your inventory, please contact Cedrick Kalukuta, at cedrick.s.kalukuta@cummins.com, to arrange for repairs. Please note that Federal law prohibits delivery of these engines, or vehicles equipped with these engines, under a sale or lease until this condition has been remedied. Cummins expects to make a field service safety campaign by April 28, 2023, to address this condition. Cummins apologizes for this inconvenience, but we are initiating this action in the interest of our customers’ safety and satisfaction with our products. Thank you for your assistance. Please confirm receipt of this communication. Sincerely, Enclosures: 1. Cummins Part 573 Defect Notification 2. List of BES CM0904 EV104B drivetrain systems

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23E-025 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Submission Date : Cummins, Inc. MAR 27, 2023 NHTSA Recall No. : 23E-025 Manufacturer Recall No. : C2677 Manufacturer Information : Manufacturer Name : Cummins, Inc. Address : Box 3005 Mail Code COB118 Columbus IN 47202-3005 Company phone : 812-377-5000 Population : Number of potentially involved : 445 Estimated percentage with defect : 100 % Equipment Information : Brand / Trade 1 : Model : Cummins Inc. PowerDrive 7000 Part No. : BES CM0904 EV104B Size : NR Function : Electric Drive Descriptive Information : Cummins is recalling the System Control Module (SCM) for certain electric drivetrain systems. This recall relates to the software calibration installed in these SCMs and includes the entire population of SCMs built within the specified dates and installed as original equipment in certain school buses. Production Dates : JUN 01, 2018 – OCT 30, 2021 Description of Defect : Description of the Defect : The SCM may activate the anti-rollback feature, causing the vehicle to move backwards uphill at a rate that may exceed certain drivers’ expectations. This may occur once the driver releases the brake while the vehicle is in reverse and pointing downhill on a grade greater than approximately 7%. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : This condition may increase the risk of crash. Description of the Cause : The cause is a software calibration issue. Identification of Any Warning that can Occur : None Involved Components : Part 573 Safety Recall Report 23E-025 Page 2 Component Name : Software, Calibration Component Description : SCM Calibration Software Component Part Number : 6373041 Supplier Identification : Component Manufacturer Name : N/A Address : NR NR Country : NR Chronology : 7/20/2022 – Cummins received a report of this condition on two Blue Bird buses at a Canadian fleet customer. (No accidents or injuries were reported.) At this time, field service engineers were on site with this customer and were able to evaluate the complaint. 7/21/2022 – 8/12/2022 – Cummins conducted engineering tests and was able to replicate the condition. 8/12/2022 – 9/30/2022 – Cummins conducted further testing to understand the cause and in conjunction with this testing, developed a preliminary calibration that addressed this condition on the vehicles from which the complaint originated. 9/30/2022 – 11/28/2022 Cummins began a Product Safety Hazard Analysis and constituted a cross-functional team to conduct further vehicle evaluation comparing the vehicle performance with the original calibration and the preliminary new calibration. 11/28/2022 – 1/30/2023 – Cummins gathered additional information regarding the operation of the anti- rollback feature, conducted an additional vehicle evaluation, and completed the Product Safety Hazard Analysis. 2/14/2023 – 3/20/2023 – Cummins escalated the issue through multiple reviews in its Product Safety Defect Determination process including gathering additional information to answer questions from the Product Safety Defect Board and arranging a vehicle demonstration of the issue for the members of the Board. 3/20/2023 – Based upon the information developed during the investigation and the additional information, Cummins Product Safety Defect Board decided to conduct a safety campaign to address this condition. To date, there have been no reports of accidents or injuries related to this condition, and no further complaints (other than the initial two that prompted this investigation.) The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 23E-025 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : The remedy is to update the SCM software calibration. A recall-specific reimbursement plan will be provided on the Recall Portal for those units not covered by the manufacturer’s limited warranty. How Remedy Component Differs from Recalled Component : Identify How/When Recall Condition was Corrected in Production : The software calibration part number will not change, but the remedy Calibration Number will be a new, unique number. Production of this product ceased on 10/30/2021 and therefore no correction was necessary for production units. Recall Schedule : Description of Recall Schedule : Cummins expects to notify Blue Bird, the only affected OEM, by 3/31/2023. Pending consultation and agreement with Blue Bird, Cummins will conduct the recall, including sending owner notifications. The timing of owner notification will be determined in consultation with Blue Bird. Cummins expects to publish the Safety Campaign to Cummins dealers on 4/28/2023 and expects to notify owners no later than 5/26/2023, pending availability of owner addresses from Blue Bird. Planned Dealer Notification Date : APR 28, 2023 – APR 28, 2023 Planned Owner Notification Date : MAY 26, 2023 – MAY 26, 2023 Purchaser Information : The following manufacturers purchased this defective/noncompliant equipment for possible use or installation in new motor vehicles or new items of motor vehicle equipment: Name : Blue Bird Corporation Address : 3920 Arkwright Road Suite 200 Macon GA 31210 Country : US Company Phone : 4788222242 * NR – Not Reported

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