23KWF – Fuel Filter Hoses May Disconnect or Leak Fuel – 2023-2024 Kenworth T280, T380, T480

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-617 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : SEP 05, 2023 NHTSA Recall No. : 23V-617 Manufacturer Recall No. : 23KWF and 23PBF Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 871 Estimated percentage with defect : 3 % Vehicle Information : Vehicle 1 : 2023-2024 Kenworth T280 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : Reference Cummins recall 23E055. Affected vehicles were identified based on the suspect engine serial numbers provided by Cummins. Production Dates : DEC 12, 2022 – MAR 09, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2023-2024 Kenworth T380 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : Reference Cummins recall 23E055. Affected vehicles were identified based on the suspect engine serial numbers provided by Cummins. Production Dates : DEC 02, 2022 – MAR 09, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 3 : 2023-2024 Kenworth T480 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : Reference Cummins recall 23E055. Affected vehicles were identified based on the suspect engine serial numbers provided by Cummins. Production Dates : DEC 06, 2022 – MAR 14, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 23V-617 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 4 : 2023-2024 Peterbilt Model 536 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : Reference Cummins recall 23E055. Affected vehicles were identified based on the suspect engine serial numbers provided by Cummins. Production Dates : DEC 08, 2022 – MAR 13, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2023-2024 Peterbilt Model 537 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : Reference Cummins recall 23E055. Affected vehicles were identified based on the suspect engine serial numbers provided by Cummins. Production Dates : OCT 28, 2022 – MAR 10, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 6 : 2023-2024 Peterbilt Model 548 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : Reference Cummins recall 23E055. Affected vehicles were identified based on the suspect engine serial numbers provided by Cummins. Production Dates : DEC 06, 2022 – MAR 07, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Reference Cummins recall 23E055. The remote fuel filter hoses installed on some of the L9/PX-9 engines may have been damaged during engine production. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : A fuel hose that becomes disconnected will result in an engine stall, which may increase the risk of a crash. A fuel leak in the presence of an ignition source may increase the risk of a fire. Description of the Cause : During production of certain engines within the recall population, the fuel hoses may have snagged on the pallet on the assembly line, causing damage to the hoses. The damage may have gone unnoticed. The root cause was identified as a poor quality crimp on the fuel hose. Part 573 Safety Recall Report 23V-617 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : Persons operating in or around the vehicle may see smoke or other visible signs of a fuel leak. Persons operating in or around the vehicle may also smell diesel fuel. Involved Components : Component Name 1 : Hose, Fuel Component Description : Fuel Carrying hose with quick connect fittings Component Part Number : 6316754 Supplier Identification : Component Manufacturer Name : Cummins Inc Address : 500 Jackson Street Columbus Indiana 47201 Country : United States Chronology : 07-26-23: Cummins notified Safety and Compliance that a NHTSA recall (ID 23E-055) was filed for a remote fuel filter hose damaged in some L9/PX-9 engines built from 11/22/2022 to 2/28/2023. Investigation opened. Cummins provided the list of engine serial number (ESN) affected to associate with their corresponding VIN and customer information. A total of 1,005 affected vehicles. 08-01-23: PACCAR found 1,804 trucks built in the same time frame that were not included in the list provided by Cummins and asked Cummins to clarify whether any should be included in the suspect population. 08-09-23: Cummins reviewed the 1,804 trucks found by PACCAR and found that 398 of those engines were built prior to switching to the suspect fuel hose on 11/23/2022, 566 were built after switching to the improved hose and 840 were built with the prior hydraulic hose (not suspect hose) under deviation. None of these trucks should be added to the suspect population. 08-15-23: Eight domestic trucks from Mexico were identified in the affected population. Kenworth Mexico was notified to coordinate the corresponding repair with Cummins. 08-25-23: Investigation summarized for Safety Committee review and affected population firmed. Part 573 Safety Recall Report 23V-617 Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 08-29-23: Safety committee meeting held. Safety Committee concurs with Cummins that a safety related defect exists and that the affected population shall be recalled. As of 8-29-23, PACCAR received 85 warranty claims and zero field reports that may be related between January 2023 and August 2023. Zero reports of deaths or injuries have been received. Description of Remedy : Description of Remedy Program : Affected vehicle owners will be notified and dealers will replace the two subject fuel hoses with hoses having improved connector crimps free of charge. Owners who incurred costs to obtain a remedy for the problem addressed by the recall in advance of receiving notification may seek reimbursement through the process outlined in the general reimbursement plan on file. How Remedy Component Differs from Recalled Component : The remedy component has an improved crimp and different date codes. Remedy hoses will have a date code of 230310 (YYMMDD format) and later. Identify How/When Recall Condition was Corrected in Production : Cummins implemented hoses with an improved connector crimp to increase the robustness of the hoses on March 3rd, 2023 and on May 14th, 2023 implemented a corrective action to prevent snagging of fuel hoses during production. Recall Schedule : Description of Recall Schedule : Notifications will be sent within 60 days. Planned Dealer Notification Date : NOV 04, 2023 – NOV 04, 2023 Planned Owner Notification Date : NOV 04, 2023 – NOV 04, 2023 * NR – Not Reported

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*** IMPORTANT SAFETY RECALL*** NHTSA Recall No. 23E-055 Cummins Campaign #C2717 Cummins Inc. Box 3005 Columbus, IN 47202-3005 USA Mail Code: 40911 Phone: 1 800 CUMMINS care.cummins.com September 13, 2023 ****** ATTAATDFDDFFFTDTFAAAAAFDTDFAFAFFDTATDDDAFTDTAADFTAAFAAFTAADAFATFA L9 engine(s) eligible for Cummins Campaign # C2717 Engine Serial Number Model Vehicle Identification Number (VIN) 99058788 548 2NP8LJ0X8RM60 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. 23E-055 Cummins Campaign #C2717 September 13, 2023 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 L9 engines that were manufactured between November 22, 2022, and February 28, 2023 This notice applies to your L9 engine(s) listed in the enclosed engine table. WHY IS A RECALL BEING CONDUCTED? The remote fuel filter hoses installed on some of the subject engines may have been damaged during engine production, possibly resulting in a fuel hose that develops leaks or becomes disconnected. A fuel hose that becomes disconnected will result in an engine stall, increasing the risk of a crash. A fuel leak in the presence of an ignition source may increase the risk of a fire. WHAT ARE WE DOING ABOUT THE PROBLEM? Cummins has released field Safety Campaign #C2717 “L9 Remote Mount Stage 2 Fuel Hose Safety Campaign” to correct this condition by replacing the two subject fuel hoses with hoses having improved connector crimps. Repair parts are currently available at Cummins Distributors and authorized Warranty Dealers. The repair will be completed free of charge (parts and labor) and most applications will require approximately 1 hour to complete. WHAT SHOULD YOU DO? Contact the nearest Cummins Distributor or authorized Warranty Dealer to arrange to have this campaign performed on your engine. The distributor or dealer will work with you to schedule the best date to complete this repair. In the meantime, however, Cummins advises you to periodically check the remote fuel filter hoses for signs of leaking, and immediately seek repairs if leaks are identified. Cummins Inc. Box 3005 Columbus, IN 47202-3005 USA Mail Code: 40911 Phone: 1 800 CUMMINS care.cummins.com 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, please forward this notice to the new owner or provide the new owner’s contact information to Cummins at cummins.campaign.administration@cummins.com so that we can notify them of this recall. 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. 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 new vehicle or equipment covered by this recall notice under a sale or lease until the defect has been remedied. 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 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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9/20/23, 1 :23 PM Aftersales Service – Federal Recall Bulletin Recall 23KWF: Cummins PX-9 Fuel Hose Number 23KWF / 23V617 / 2023-495 / C2717 Supplier Cummins Description Cummins PX-9 Fuel Hose Date 9/20/2023 What’s New Safety Recall t1 Edit c__O Clone Reference Cummins Recall C2717. Kenworth has been alerted to a defect in certain PX-9 remote fuel filter hoses installed on Model Year 2023-2024 T280, T380, and T480 chassis. The hoses could become disconnected, causing an engine stall and increasing the risk of a crash. Fuel leaks near an ignition source may increase the risk of fire. Refer to Cummins Recall C2717 for repair information. Introduction Cummins has alerted Kenworth to a defect which relates to motor vehicle safety in certain model year 2023 and 2024 T280, T380, and T480 vehicles. A fuel hose that becomes disconnected will result in an engine stall, increasing the risk of a crash. A fuel leak in the presence of an ignition source may increase the risk of a fire. Reference Cummins Recall C2717. Situation 507 (458 U.S. and 49 Canada) Model Year 2023-2024 T280, T380 and T480 chassis built from 12/02/22 to 03/14/23 equipped with Cummins PX-9 https://paccarnet.sharepoint.com/sitepages/wtyfedrecallbltndetail.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm5IdC5zaGFyZXBvaW50LmNvbS9zaXRlcy9hdXRob3J3YXJyYW50eSlslmxpc3… 1/2 9/20/23, 1 :23 PM engines. Resolution Safety Recall Aftersales Service – Federal Recall Bulletin Service all chassis affected that enter your dealership, even if the customer has no issue with the chassis. 1. Review the attached chassis list for your dealer code and schedule your customer(s) for service if their chassis is on the list. 2. In Service Management, select Campaign 2717 to add it to the case. If the unit is released back into service without performing the repair, make sure to also release the Campaign in Service Management 3. If you are not using Service Management to start repair orders, review SIR for “Complete” or “In Process” next to the 2717 campaign code prior to performing this repair. 4. Follow the procedures in Cummins C2717 Safety Recall to replace the fuel hoses. Go to Cummins QuickServe and refer to the Cummins Recall – C2717. Federal Law It is a violation of Federal law for a dealer to sell or lease new vehicles covered by this recall until the defect or noncompliance has been corrected. Warranty Go to Cummins QuickServe and refer to the Cummins Recall C2717. File warranty claims through the Cummins warranty system. SIR will indicate chassis involved in this recall with the designator of “2717” in the campaign field. Procedure Please follow your dealership’s safety procedures and precautions to ensure the vehicle can be safely repaired and maintained. Please refer to Cummins QuickServe for repair procedure. Reference Cummins Recall C2717. Links Chassis List https://paccarnet.sharepoint.com/sitepages/wtyfedrecallbltndetail.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm51dC5zaGFyZXBvaW50LmNvbS9zaXRlcy9hdXRob3J3YXJyYW50eSlslmxpc3… 2/2

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