R22BZ-SB – ECM Short Circuit May Cause Engine Stall – 2023 Blue Bird All American School Buses

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A CUMMINS FIELD CAMPAIGN Please Deliver To: Service Managers and Warranty Decision Makers FROM: Cummins Global Warranty Administration Communications Subject: CM2450 ECM Replacement Safety Campaign Number: C2614 Date: 27-Sep-2022 Expires: 01-Sep-2050 (U.S./Canada) 01-Sep-2050 (International) Attention: Worldwide distr./ branches and Div./Reg Offices U.S. / Canadian Dealers U.S. / Canadian Distr./Branches and Div. Offices (Automotive) If additional information is required, please contact your Cummins Warranty Operations Group Leader. DESCRIPTION: This Safety Campaign is being issued to replace CM2450 Engine Control Modules (ECM) on certain engines. ECMs may develop an internal electrical short, possibly resulting in an engine stall without warning. This Safety Campaign authorizes certified repair locations to replace the ECM and perform a recalibration. Cummins has reported this issue to the U.S. National Highway Traffic Safety Administration (NHTSA), which has assigned it Recall Number 22E-063. ACTION: In order to qualify for repair under this field action, an engine: 1 will be covered regardless of coverage status, and 2 must show as OPEN on QuickServe® Online for this field action. NOTE: The ESN list is attached for reference. After verifying that the engine meets the above requirements, perform the following actions: 1 Replace ECM in accordance with repair procedure 19-031 within appropriate service manual 2 Recalibrate ECM in accordance with repair procedure 19-032 within appropriate service manual MATERIAL DISPOSITION: Where applicable, items removed should be returned to ReCon for core credit. Unless otherwise indicated, items with no core liability can be scrapped. REIMBURSEMENTS: Parts: NOTE: All parts listed are OPTIONAL. Claim only the parts required to complete the repair. Please note that Pre- Authorization is required to secure parts to complete the directed repairs. Please follow your normal parts channel processes to secure the Pre-Authorization from Customer Order Management (COM). Where multiple ECMs are needed, eligible ESNs MUST be provided to secure multiple ECM order requests. NOTE: ReCon (RX) parts should be used and claimed when performing all Cummins Field Actions. New or NX parts should only be used when making before-inservice repairs. Additionally, due to local laws, RX parts may not be available for use in the repair. If this is the case for your region, use the New part equivalent of the appropriate ReCon part. Further, if RX parts are not readily available to complete the repair in a timely fashion, the new part equivalent can be secured and used for the repair. The following parts are covered under this field action: Part Number Quantity Description 557239100NX 1 MDL,CNT (OPTIONAL) 557239100RX 1 MDL,CNT (OPTIONAL) NOTE: SRTs to gain access that are required to complete the repair, that are sufficiently explained in the claim narrative, may also be claimed on this action. NOTE: All SRTs listed are OPTIONAL. Select ONLY the appropriate SRTs for the repair performed. Labor using applicable Access Code and Time: SRT Code Description Time 00-90X Administrative time 19-0G5 Engine Control Module Calibration Code – Transfer (CMI) 19-0YW Engine Control Module – Remove and Install – X15 CM2450 X124B 19-1JB Engine Control Module – Remove and Install – L9 CM2450 L126B 19-1K4 Engine Control Module – Remove and Install – X15 CM2450 X134B 19-1NT ENGINE CONTROL MODULE – REMOVE AND INSTALL – X12 CM2450 X137B 19-1RQ Engine Control Module – Remove and Install – B6.7 CM2450 B155B Travel: Travel is covered under this field action. Towing is covered under this field action. Other Claimables: Consumables are covered under this field action. NOTE: Additional parts, such as o-rings, gaskets and fasteners, that are required to complete the repair, but not listed, may be claimed in Other Claimables. Please consolidate all consumables and claim them as one line item in Other Claimables titled CAMPAIGN SUPPLIES or other appropriate selections. Please include brief summaries on the details of items claimed. A lack of documentation in the narrative may result in a reduction in claim reimbursement or claim denial. Claim Instructions: For Cummins Dealers, claims for this Field Campaign must be filed via RAPIDSERVE™ Web (rsw.cummins.com). For information regarding RAPIDSERVE™ Web, please reference the “Warranty” tab in QuickServe® Online. If there are additional questions, please contact your local Cummins Distributor. Account Code: ………………………………………………………………………………………………………………………………………….. 65 Pay Code: ………………………………………………………………………………………………………….. North America Distributor = X Pay Code: ……………………………………………………………………………………………………………….. North America Dealer = D Pay Code: ………………………………………………………………………………………………………………. International Distributor = I Pay Code: ………………………………………………………………………………………………………………….. International Dealer = R Failure Code: ………………………………………………………………………………………………………………………………….. WEICMG Attachments c2614_esn-list.xlsx

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C. September 26, 2022 *** IMPORTANT SAFETY RECALL*** NHTSA Recall No. 22E-063 Cummins Campaign #C2614 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 86.7, 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://prodreq.cummins.com/prodreg/#/webform/contactlnfo. 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 .,. C *** 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. Cummins Inc Box 3005 Columbus, IN 47202 – 3005 USA Mail Code 40911 Phone 1 800 CUMMINS care cummins com

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A CUMMINS FIELD CAMPAIGN Please Deliver To: Service Managers and Warranty Decision Makers FROM: Cummins Global Warranty Administration Communications Subject: CM2450 ECM Replacement Safety Campaign Number: C2614 Date: 27-Sep-2022 Expires: 01-Sep-2050 (U.S./Canada) 01-Sep-2050 (International) Attention: Worldwide distr./ branches and Div./Reg Offices U.S. / Canadian Dealers U.S. / Canadian Distr./Branches and Div. Offices (Automotive) If additional information is required, please contact your Cummins Warranty Operations Group Leader. DESCRIPTION: This Safety Campaign is being issued to replace CM2450 Engine Control Modules (ECM) on certain engines. ECMs may develop an internal electrical short, possibly resulting in an engine stall without warning. This Safety Campaign authorizes certified repair locations to replace the ECM and perform a recalibration. Cummins has reported this issue to the U.S. National Highway Traffic Safety Administration (NHTSA), which has assigned it Recall Number 22E-063. ACTION: In order to qualify for repair under this field action, an engine: 1 will be covered regardless of coverage status, and 2 must show as OPEN on QuickServe® Online for this field action. NOTE: The ESN list is attached for reference. After verifying that the engine meets the above requirements, perform the following actions: 1 Replace ECM in accordance with repair procedure 19-031 within appropriate service manual 2 Recalibrate ECM in accordance with repair procedure 19-032 within appropriate service manual MATERIAL DISPOSITION: Where applicable, items removed should be returned to ReCon for core credit. Unless otherwise indicated, items with no core liability can be scrapped. REIMBURSEMENTS: Parts: NOTE: All parts listed are OPTIONAL. Claim only the parts required to complete the repair. Please note that Pre- Authorization is required to secure parts to complete the directed repairs. Please follow your normal parts channel processes to secure the Pre-Authorization from Customer Order Management (COM). Where multiple ECMs are needed, eligible ESNs MUST be provided to secure multiple ECM order requests. NOTE: ReCon (RX) parts should be used and claimed when performing all Cummins Field Actions. New or NX parts should only be used when making before-inservice repairs. Additionally, due to local laws, RX parts may not be available for use in the repair. If this is the case for your region, use the New part equivalent of the appropriate ReCon part. Further, if RX parts are not readily available to complete the repair in a timely fashion, the new part equivalent can be secured and used for the repair. The following parts are covered under this field action: Part Number Quantity Description 557239100NX 1 MDL,CNT (OPTIONAL) 557239100RX 1 MDL,CNT (OPTIONAL) NOTE: SRTs to gain access that are required to complete the repair, that are sufficiently explained in the claim narrative, may also be claimed on this action. NOTE: All SRTs listed are OPTIONAL. Select ONLY the appropriate SRTs for the repair performed. Labor using applicable Access Code and Time: SRT Code Description Time 00-90X Administrative time 19-0G5 Engine Control Module Calibration Code – Transfer (CMI) 19-0YW Engine Control Module – Remove and Install – X15 CM2450 X124B 19-1JB Engine Control Module – Remove and Install – L9 CM2450 L126B 19-1K4 Engine Control Module – Remove and Install – X15 CM2450 X134B 19-1NT ENGINE CONTROL MODULE – REMOVE AND INSTALL – X12 CM2450 X137B 19-1RQ Engine Control Module – Remove and Install – B6.7 CM2450 B155B Travel: Travel is covered under this field action. Towing is covered under this field action. Other Claimables: Consumables are covered under this field action. NOTE: Additional parts, such as o-rings, gaskets and fasteners, that are required to complete the repair, but not listed, may be claimed in Other Claimables. Please consolidate all consumables and claim them as one line item in Other Claimables titled CAMPAIGN SUPPLIES or other appropriate selections. Please include brief summaries on the details of items claimed. A lack of documentation in the narrative may result in a reduction in claim reimbursement or claim denial. Claim Instructions: For Cummins Dealers, claims for this Field Campaign must be filed via RAPIDSERVE™ Web (rsw.cummins.com). For information regarding RAPIDSERVE™ Web, please reference the “Warranty” tab in QuickServe® Online. If there are additional questions, please contact your local Cummins Distributor. Account Code: ………………………………………………………………………………………………………………………………………….. 65 Pay Code: ………………………………………………………………………………………………………….. North America Distributor = X Pay Code: ……………………………………………………………………………………………………………….. North America Dealer = D Pay Code: ………………………………………………………………………………………………………………. International Distributor = I Pay Code: ………………………………………………………………………………………………………………….. International Dealer = R Failure Code: ………………………………………………………………………………………………………………………………….. WEICMG Attachments c2614_esn-list.xlsx

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-600 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Blue Bird Body Company Submission Date : AUG 08, 2022 NHTSA Recall No. : 22V-600 Manufacturer Recall No. : R22BZ – SB Manufacturer Information : Manufacturer Name : Blue Bird Body Company Address : P.O. Box 937 402 Blue Bird Boulevard Fort Valley GA 31030 Company phone : 478-822-2242 Population : Number of potentially involved : 2 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 Blue Bird All American Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The engine is controlled by an Engine Control Module (ECM), which received electrical power via a fused circuit from the vehicle’s battery. This defect notification covers the entire population of engines manufacturer with the suspect ECM’s, as identified by the supplier. Cummins will conduct the notification and remedy campaign on Blue Bird’s behalf. Production Dates : JUL 12, 2022 – JUL 18, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : The ECM’s within the subject population 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 : An unexpected engine stall without the ability to restart the engine may lead to an increased risk of a crash. Description of the Cause : A screw in the suplier’s selective solder fixture backed out of position, pushing an electrolytic capacitor frame into the Printed Circuit Board (PCB) during ECM production. Identification of Any Warning that can Occur : None Part 573 Safety Recall Report 22V-600 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 5572391 (Cummins) Component Name 2 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 5677664 (Cummins) Component Name 3 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 6372744 (Cummins) Supplier Identification : Component Manufacturer Name : Cummins Incorporated Address : 500 Jackson Street Columbus Indiana 47202-3005 Country : United States Chronology : June 14, 2022: Cummins received a report from an OEM of an ECM failure at an OEM facility. June 21, 2022: Cummins notified the ECM supplier, Vitesco, of the failure. June 21-29, 2022: Cummins received additional reports from OEMs of ECM failures occurring during production. Cummins collected and returned three ECM’s to the supplier for failure analysis. June 28-20, 2022: Vitesco informed Cummins about the Potential Circuit Board (PCB) damage after confirming that ECM’s returned from Cummins were due to this failure mode. According to the supplier, ECM’s with potentially damaged PCB’s were produced May 16, 2022 through June 2, 2022. Cummins initiated containment actions at impacted engine plants and vehicle OEM plants. June 30, 2022: Cummins and Vitesco began investigating the failure mechanisms and potential screening test methods. June 14, 2022 through July 19, 2022: Cummins received two field reports alleging on-road engine stalls. July 11-12, 2022: Cummins conducted a Product Safety Hazard Analysis. Part 573 Safety Recall Report 22V-600 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 July 12-19, 2022: Cummins escalated the issue through its Product Safety Defect Determination process, including gathering additional information and conducting additional analysis for the Product Safety Hazard Analysis. July 21, 2022: Based upon the results of the investigation, the Cummins Product Safety Defect Board decided this issue constitutes a safety defect. Accordingly, Cummins will notify OEM customers of this defect. For those OEM’s that make a safety defect determination with respect to their potentially affected vehicle population, Cummins will, at the OEM’s request, conduct the notification and remedy campaign on their behalf. To date, there have been no reports of accidents or injuries due to this condition. Note regarding production start dates: For reasons unrelated to this issue, some engines were built without ECM’s prior to May 16, 2022, and later upfit with suspect ECMs. August 3, 3022: Blue Bird was notified by Cummins. Description of Remedy : Description of Remedy Program : Cummins is currently developing the remedy for the recalled units. Pursuant to 49 CFR 577.11(e), Cummins requests that it be exempt from providing notification of a reimbursement plan. Any pre-notification product failure would have been replaced under the manufacturer’s limited warranty. Accordingly, no person would be eligible for reimbursement pursuant to 573.13. Cummins will reimburse the cost of the repair related to this recall at no cost to the Dealer or to the vehicle owner. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : Vitesco 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 : Dealer and Owner Notifications are to be issued on or before September 26, 2022. Parts availability undetermined at this time. Cummins will conduct the recall and notify affected owners. Cummins will be prepared to notify owners no later than September 26, 2022. Cummins will reimburse the labor cost of the repair related to this recall at no cost to the Dealer or to the vehicle owner. 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-600 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Blue Bird Body Company Submission Date : AUG 12, 2022 NHTSA Recall No. : 22V-600 Manufacturer Recall No. : R22BZ – SB Manufacturer Information : Manufacturer Name : Blue Bird Body Company Address : P.O. Box 937 402 Blue Bird Boulevard Fort Valley GA 31030 Company phone : 478-822-2242 Population : Number of potentially involved : 2 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 Blue Bird All American Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The engine is controlled by an Engine Control Module (ECM), which received electrical power via a fused circuit from the vehicle’s battery. This defect notification covers the entire population of engines manufacturer with the suspect ECM’s, as identified by the supplier. Cummins will conduct the notification and remedy campaign on Blue Bird’s behalf. Production Dates : JUL 12, 2022 – JUL 18, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : The ECM’s within the subject population 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 : An unexpected engine stall without the ability to restart the engine may lead to an increased risk of a crash. Description of the Cause : A screw in the suplier’s selective solder fixture backed out of position, pushing an electrolytic capacitor frame into the Printed Circuit Board (PCB) during ECM production. Identification of Any Warning that can Occur : None Part 573 Safety Recall Report 22V-600 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 5572391 (Cummins) Component Name 2 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 5677664 (Cummins) Component Name 3 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 6372744 (Cummins) Supplier Identification : Component Manufacturer Name : Cummins Incorporated Address : 500 Jackson Street Columbus Indiana 47202-3005 Country : United States Chronology : June 14, 2022: Cummins received a report from an OEM of an ECM failure at an OEM facility. June 21, 2022: Cummins notified the ECM supplier, Vitesco, of the failure. June 21-29, 2022: Cummins received additional reports from OEMs of ECM failures occurring during production. Cummins collected and returned three ECM’s to the supplier for failure analysis. June 28-20, 2022: Vitesco informed Cummins about the Potential Circuit Board (PCB) damage after confirming that ECM’s returned from Cummins were due to this failure mode. According to the supplier, ECM’s with potentially damaged PCB’s were produced May 16, 2022 through June 2, 2022. Cummins initiated containment actions at impacted engine plants and vehicle OEM plants. June 30, 2022: Cummins and Vitesco began investigating the failure mechanisms and potential screening test methods. June 14, 2022 through July 19, 2022: Cummins received two field reports alleging on-road engine stalls. July 11-12, 2022: Cummins conducted a Product Safety Hazard Analysis. Part 573 Safety Recall Report 22V-600 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 July 12-19, 2022: Cummins escalated the issue through its Product Safety Defect Determination process, including gathering additional information and conducting additional analysis for the Product Safety Hazard Analysis. July 21, 2022: Based upon the results of the investigation, the Cummins Product Safety Defect Board decided this issue constitutes a safety defect. Accordingly, Cummins will notify OEM customers of this defect. For those OEM’s that make a safety defect determination with respect to their potentially affected vehicle population, Cummins will, at the OEM’s request, conduct the notification and remedy campaign on their behalf. To date, there have been no reports of accidents or injuries due to this condition. Note regarding production start dates: For reasons unrelated to this issue, some engines were built without ECM’s prior to May 16, 2022, and later upfit with suspect ECMs. August 3, 3022: Blue Bird was notified by Cummins. Description of Remedy : Description of Remedy Program : Cummins is currently developing the remedy for the recalled units. Pursuant to 49 CFR 577.11(e), Cummins requests that it be exempt from providing notification of a reimbursement plan. Any pre-notification product failure would have been replaced under the manufacturer’s limited warranty. Accordingly, no person would be eligible for reimbursement pursuant to 573.13. Cummins will reimburse the cost of the repair related to this recall at no cost to the Dealer or to the vehicle owner. If the modifications directed by this notification were performed on your bus prior to the receipt of this recall notification, please provide a a copy of the work order/invoice to Cummins. The Cummins contact information for reimbursement will be listed in the Dealer and Owner communications. How Remedy Component Differs from Recalled Component : The remedy ECM will have a different serial number than the recalled component. Identify How/When Recall Condition was Corrected in Production : Vitesco 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 : Dealer and Owner Notifications are to be issued on or before September 26, 2022. Parts availability undetermined at this time. Cummins will conduct the recall and notify affected owners. Cummins will be prepared to notify owners no later than September 26, 2022. Cummins will reimburse the labor cost of the repair related to this recall at no cost to the Dealer or to the vehicle owner. Planned Dealer Notification Date : SEP 26, 2022 – SEP 26, 2022 Planned Owner Notification Date : SEP 26, 2022 – SEP 26, 2022 Part 573 Safety Recall Report 22V-600 Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-600 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Blue Bird Body Company Submission Date : AUG 12, 2022 NHTSA Recall No. : 22V-600 Manufacturer Recall No. : R22BZ – SB Manufacturer Information : Manufacturer Name : Blue Bird Body Company Address : P.O. Box 937 402 Blue Bird Boulevard Fort Valley GA 31030 Company phone : 478-822-2242 Population : Number of potentially involved : 2 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 Blue Bird All American Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The engine is controlled by an Engine Control Module (ECM), which received electrical power via a fused circuit from the vehicle’s battery. This defect notification covers the entire population of engines manufacturer with the suspect ECM’s, as identified by the supplier. Cummins will conduct the notification and remedy campaign on Blue Bird’s behalf. Production Dates : JUL 12, 2022 – JUL 18, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : The ECM’s within the subject population 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 : An unexpected engine stall without the ability to restart the engine may lead to an increased risk of a crash. Description of the Cause : A screw in the suplier’s selective solder fixture backed out of position, pushing an electrolytic capacitor frame into the Printed Circuit Board (PCB) during ECM production. Identification of Any Warning that can Occur : None Part 573 Safety Recall Report 22V-600 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 5572391 (Cummins) Component Name 2 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 5677664 (Cummins) Component Name 3 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 6372744 (Cummins) Supplier Identification : Component Manufacturer Name : Cummins Incorporated Address : 500 Jackson Street Columbus Indiana 47202-3005 Country : United States Chronology : June 14, 2022: Cummins received a report from an OEM of an ECM failure at an OEM facility. June 21, 2022: Cummins notified the ECM supplier, Vitesco, of the failure. June 21-29, 2022: Cummins received additional reports from OEMs of ECM failures occurring during production. Cummins collected and returned three ECM’s to the supplier for failure analysis. June 28-20, 2022: Vitesco informed Cummins about the Potential Circuit Board (PCB) damage after confirming that ECM’s returned from Cummins were due to this failure mode. According to the supplier, ECM’s with potentially damaged PCB’s were produced May 16, 2022 through June 2, 2022. Cummins initiated containment actions at impacted engine plants and vehicle OEM plants. June 30, 2022: Cummins and Vitesco began investigating the failure mechanisms and potential screening test methods. June 14, 2022 through July 19, 2022: Cummins received two field reports alleging on-road engine stalls. July 11-12, 2022: Cummins conducted a Product Safety Hazard Analysis. Part 573 Safety Recall Report 22V-600 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 July 12-19, 2022: Cummins escalated the issue through its Product Safety Defect Determination process, including gathering additional information and conducting additional analysis for the Product Safety Hazard Analysis. July 21, 2022: Based upon the results of the investigation, the Cummins Product Safety Defect Board decided this issue constitutes a safety defect. Accordingly, Cummins will notify OEM customers of this defect. For those OEM’s that make a safety defect determination with respect to their potentially affected vehicle population, Cummins will, at the OEM’s request, conduct the notification and remedy campaign on their behalf. To date, there have been no reports of accidents or injuries due to this condition. Note regarding production start dates: For reasons unrelated to this issue, some engines were built without ECM’s prior to May 16, 2022, and later upfit with suspect ECMs. August 3, 3022: Blue Bird was notified by Cummins. Description of Remedy : Description of Remedy Program : Cummins is currently developing the remedy for the recalled units. Pursuant to 49 CFR 577.11(e), Cummins requests that it be exempt from providing notification of a reimbursement plan. Any pre-notification product failure would have been replaced under the manufacturer’s limited warranty. Accordingly, no person would be eligible for reimbursement pursuant to 573.13. Cummins will reimburse the cost of the repair related to this recall at no cost to the Dealer or to the vehicle owner. If the modifications directed by this notification were performed on your bus prior to the receipt of this recall notification, please provide a a copy of the work order/invoice to Cummins. The Cummins contact information for reimbursement will be listed in the Dealer and Owner communications. How Remedy Component Differs from Recalled Component : The remedy ECM will have a different serial number than the recalled component. Identify How/When Recall Condition was Corrected in Production : Vitesco 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 : Dealer and Owner Notifications are to be issued on or before September 26, 2022. Parts availability undetermined at this time. Cummins will conduct the recall and notify affected owners. Cummins will be prepared to notify owners no later than September 26, 2022. Cummins will reimburse the labor cost of the repair related to this recall at no cost to the Dealer or to the vehicle owner. Planned Dealer Notification Date : SEP 26, 2022 – SEP 26, 2022 Planned Owner Notification Date : SEP 26, 2022 – SEP 26, 2022 Part 573 Safety Recall Report 22V-600 Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-600 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Blue Bird Body Company Submission Date : AUG 10, 2022 NHTSA Recall No. : 22V-600 Manufacturer Recall No. : R22BZ – SB Manufacturer Information : Manufacturer Name : Blue Bird Body Company Address : P.O. Box 937 402 Blue Bird Boulevard Fort Valley GA 31030 Company phone : 478-822-2242 Population : Number of potentially involved : 2 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 Blue Bird All American Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The engine is controlled by an Engine Control Module (ECM), which received electrical power via a fused circuit from the vehicle’s battery. This defect notification covers the entire population of engines manufacturer with the suspect ECM’s, as identified by the supplier. Cummins will conduct the notification and remedy campaign on Blue Bird’s behalf. Production Dates : JUL 12, 2022 – JUL 18, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : The ECM’s within the subject population 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 : An unexpected engine stall without the ability to restart the engine may lead to an increased risk of a crash. Description of the Cause : A screw in the suplier’s selective solder fixture backed out of position, pushing an electrolytic capacitor frame into the Printed Circuit Board (PCB) during ECM production. Identification of Any Warning that can Occur : None Part 573 Safety Recall Report 22V-600 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Involved Components : Component Name 1 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 5572391 (Cummins) Component Name 2 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 5677664 (Cummins) Component Name 3 : Module, Electronic Control (Cummins) Component Description : Engine Control Module (Cummins) Component Part Number : 6372744 (Cummins) Supplier Identification : Component Manufacturer Name : Cummins Incorporated Address : 500 Jackson Street Columbus Indiana 47202-3005 Country : United States Chronology : June 14, 2022: Cummins received a report from an OEM of an ECM failure at an OEM facility. June 21, 2022: Cummins notified the ECM supplier, Vitesco, of the failure. June 21-29, 2022: Cummins received additional reports from OEMs of ECM failures occurring during production. Cummins collected and returned three ECM’s to the supplier for failure analysis. June 28-20, 2022: Vitesco informed Cummins about the Potential Circuit Board (PCB) damage after confirming that ECM’s returned from Cummins were due to this failure mode. According to the supplier, ECM’s with potentially damaged PCB’s were produced May 16, 2022 through June 2, 2022. Cummins initiated containment actions at impacted engine plants and vehicle OEM plants. June 30, 2022: Cummins and Vitesco began investigating the failure mechanisms and potential screening test methods. June 14, 2022 through July 19, 2022: Cummins received two field reports alleging on-road engine stalls. July 11-12, 2022: Cummins conducted a Product Safety Hazard Analysis. Part 573 Safety Recall Report 22V-600 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 July 12-19, 2022: Cummins escalated the issue through its Product Safety Defect Determination process, including gathering additional information and conducting additional analysis for the Product Safety Hazard Analysis. July 21, 2022: Based upon the results of the investigation, the Cummins Product Safety Defect Board decided this issue constitutes a safety defect. Accordingly, Cummins will notify OEM customers of this defect. For those OEM’s that make a safety defect determination with respect to their potentially affected vehicle population, Cummins will, at the OEM’s request, conduct the notification and remedy campaign on their behalf. To date, there have been no reports of accidents or injuries due to this condition. Note regarding production start dates: For reasons unrelated to this issue, some engines were built without ECM’s prior to May 16, 2022, and later upfit with suspect ECMs. August 3, 3022: Blue Bird was notified by Cummins. Description of Remedy : Description of Remedy Program : Cummins is currently developing the remedy for the recalled units. Pursuant to 49 CFR 577.11(e), Cummins requests that it be exempt from providing notification of a reimbursement plan. Any pre-notification product failure would have been replaced under the manufacturer’s limited warranty. Accordingly, no person would be eligible for reimbursement pursuant to 573.13. Cummins will reimburse the cost of the repair related to this recall at no cost to the Dealer or to the vehicle owner. How Remedy Component Differs from Recalled Component : The remedy ECM will have a different serial number than the recalled component. Identify How/When Recall Condition was Corrected in Production : Vitesco 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 : Dealer and Owner Notifications are to be issued on or before September 26, 2022. Parts availability undetermined at this time. Cummins will conduct the recall and notify affected owners. Cummins will be prepared to notify owners no later than September 26, 2022. Cummins will reimburse the labor cost of the repair related to this recall at no cost to the Dealer or to the vehicle owner. 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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