23KWE – Driveline Fasteners May Loosen – 2023-2024 Kenworth T280, 2023 Kenworth T480, & 2024 Kenworth T380

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-504 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : JUL 21, 2023 NHTSA Recall No. : 23V-504 Manufacturer Recall No. : 23KWE and 23PBE Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 19 Estimated percentage with defect : 50 % Vehicle Information : Vehicle 1 : 2023-2024 Peterbilt 536 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Peterbilt Models 536 only 3 trucks Production Dates : AUG 10, 2022 – APR 27, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2023-2024 Peterbilt 537 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Peterbilt Model 537, only 2 trucks Production Dates : OCT 19, 2022 – APR 26, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 23V-504 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 3 : 2022-2022 Peterbilt 548 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Peterbilt Models 548, only 8 trucks Production Dates : JUL 15, 2022 – SEP 16, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 4 : 2023-2024 Kenworth T280 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Kenworth Model T280, only 4 trucks Production Dates : JUL 22, 2022 – APR 25, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2024-2024 Kenworth T380 Vehicle Type : Body Style : Power Train : NR Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Kenworth Model T380, only 1 truck Production Dates : MAY 04, 2023 – MAY 04, 2023 VIN Range 1 : Begin : 2NK4HJ7X3RM333715 End : 2NK4HJ7X3RM333715 Not sequential Part 573 Safety Recall Report 23V-504 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 6 : 2023-2023 Kenworth T480 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Kenworth Model T480, only 1 truck Production Dates : JUL 28, 2022 – JUL 28, 2022 VIN Range 1 : Begin : 2XK5AJ8X2PM236385 End : 2XK5AJ8X2PM236385 Not sequential Description of Defect : Description of the Defect : A locking feature may not have been used on fastener threads while connecting the flange mounted yoke and may allow the driveline fasteners to become loose. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : A driveline may detach from the truck without properly fastened flange yoke bolts and may increase the risk of a crash or injury. Description of the Cause : A locking feature on the flange yoke fasteners may not have been applied when certain trucks were finished in an offline installation, originally due to component shortages during scheduled production. Identification of Any Warning that can Occur : Driver may feel vibration while driving at certain speeds. Involved Components : Component Name 1 : Nut-Hex, M12 Bolt and Loctite Component Description : Fasterners and thread lock material Component Part Number : K169-158-12CA, W34-1180, Loctite 243 Supplier Identification : Component Manufacturer Part 573 Safety Recall Report 23V-504 Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 Name : PACCAR Address : NR NR Country : United States Chronology : 5/31/2023 Field Service reported that 2 medium duty trucks had loose or missing flange mounted driveline yokes at the rear of the transmission 6/1/2023 Safety & Compliance engaged the Quality group at the Ste. Therese plant. They confirmed this joint would have been tightened at the plant, not a supplier. 6/26/2023 Field Service looking to check additional trucks in the field. Quality group confirmed use of Loctite is required on all trucks as they inspect and replace fasteners. 6/30/2023 Engineering reconfirmed that these drivelines only the Ste. Therese plants. 7/12/2023 Quality group confirmed offline installation instructions for critical components had been updated with the TX-8 yoke requirement. 7/14/2023 A Joint Safety Committee meeting was held Description of Remedy : Description of Remedy Program : Paccar will notify owners, and dealers will replace the 4 fasteners and add a thread locking feature free of charge. Owners who incurred costs to obtain a remedy for the problem addressed in 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 will include a thread locking feature to hold the joint from loosening. Identify How/When Recall Condition was Corrected in Production : Normal scheduled production trucks were not affected. This was caused by an unscheduled offline installation. The offline installation instruction and sign off has been updated with the TX-8 transmission yoke requirement. Recall Schedule : Description of Recall Schedule : Customers will be notified within 60 days. Field service group is already being proactive to contact customers ahead of sending letters. Planned Dealer Notification Date : SEP 19, 2023 – SEP 19, 2023 Part 573 Safety Recall Report 23V-504 Page 5 The information contained in this report was submitted pursuant to 49 CFR §573 Planned Owner Notification Date : SEP 19, 2023 – SEP 19, 2023 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 23V-504 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : JUL 27, 2023 NHTSA Recall No. : 23V-504 Manufacturer Recall No. : 23KWE and 23PBE Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 19 Estimated percentage with defect : 50 % Vehicle Information : Vehicle 1 : 2023-2024 Peterbilt 536 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Peterbilt Models 536 only 3 trucks Production Dates : MAY 31, 2022 – MAR 27, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2023-2024 Peterbilt 537 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Peterbilt Model 537, only 2 trucks Production Dates : SEP 29, 2022 – MAR 13, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 23V-504 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 3 : 2023-2023 Peterbilt 548 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Peterbilt Models 548, only 8 trucks Production Dates : APR 20, 2022 – JUN 28, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 4 : 2023-2024 Kenworth T280 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Kenworth Model T280, only 4 trucks Production Dates : APR 15, 2022 – MAR 14, 2023 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2024-2024 Kenworth T380 Vehicle Type : Body Style : Power Train : NR Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Kenworth Model T380, only 1 truck Production Dates : MAR 13, 2023 – MAR 13, 2023 VIN Range 1 : Begin : 2NK4HJ7X3RM333715 End : 2NK4HJ7X3RM333715 Not sequential Part 573 Safety Recall Report 23V-504 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 6 : 2023-2023 Kenworth T480 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : – Trucks built with TX-8 transmissions with flange mounted yokes that were missing engines, drivelines or rear axles during initial plant build and were completed offline at the overflow Manheim yard or Tente Est/Nord area next to the plant. – Recalled product may not have had a thread locking material applied to fasteners – Kenworth Model T480, only 1 truck Production Dates : JUN 30, 2022 – JUN 30, 2022 VIN Range 1 : Begin : 2XK5AJ8X2PM236385 End : 2XK5AJ8X2PM236385 Not sequential Description of Defect : Description of the Defect : A locking feature may not have been used on fastener threads while connecting the flange mounted yoke and may allow the driveline fasteners to become loose. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : A driveline may detach from the truck without properly fastened flange yoke bolts and may increase the risk of a crash or injury. Description of the Cause : A locking feature on the flange yoke fasteners may not have been applied when certain trucks were finished in an offline installation, originally due to component shortages during scheduled production. Identification of Any Warning that can Occur : Driver may feel vibration while driving at certain speeds. Involved Components : Component Name 1 : Nut-Hex, M12 Bolt and Loctite Component Description : Fasterners and thread lock material Component Part Number : K169-158-12CA, W34-1180, Loctite 243 Supplier Identification : Component Manufacturer Part 573 Safety Recall Report 23V-504 Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 Name : PACCAR Address : NR NR Country : United States Chronology : 5/31/2023 Field Service reported that 2 medium duty trucks had loose or missing flange mounted driveline yokes at the rear of the transmission 6/1/2023 Safety & Compliance engaged the Quality group at the Ste. Therese plant. They confirmed this joint would have been tightened at the plant, not a supplier. 6/26/2023 Field Service looking to check additional trucks in the field. Quality group confirmed use of Loctite is required on all trucks as they inspect and replace fasteners. 6/30/2023 Engineering reconfirmed that these drivelines only the Ste. Therese plants. 7/12/2023 Quality group confirmed offline installation instructions for critical components had been updated with the TX-8 yoke requirement. 7/14/2023 A Joint Safety Committee meeting was held Description of Remedy : Description of Remedy Program : Paccar will notify owners, and dealers will replace the 4 fasteners and add a thread locking feature free of charge. Owners who incurred costs to obtain a remedy for the problem addressed in 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 will include a thread locking feature to hold the joint from loosening. Identify How/When Recall Condition was Corrected in Production : Normal scheduled production trucks were not affected. This was caused by an unscheduled offline installation. The offline installation instruction and sign off has been updated with the TX-8 transmission yoke requirement. Recall Schedule : Description of Recall Schedule : Customers will be notified within 60 days. Field service group is already being proactive to contact customers ahead of sending letters. Planned Dealer Notification Date : SEP 19, 2023 – SEP 19, 2023 Part 573 Safety Recall Report 23V-504 Page 5 The information contained in this report was submitted pursuant to 49 CFR §573 Planned Owner Notification Date : SEP 19, 2023 – SEP 19, 2023 * NR – Not Reported

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