2021–2024 Kenworth T280, 2021–2024 Kenworth T380, 2020–2024 Kenworth T480 and 3 other models Recall: Timing of the trailer brake release may be delayed
NHTSA campaign 23V661000 · Service Brakes, Air · filed Sep 29, 2023 · verified Jul 30, 2026
The defect
PACCAR Incorporated (PACCAR) is recalling certain 2021-2024 Kenworth T280, T380, 2020-2024 Peterbilt 548, 536, 2024 Peterbilt 537, and 2020-2024 Kenworth T480 trucks. The timing of the trailer brake release may be delayed. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
The risk
A delay in the trailer brake release can create instability to the trailer and increase the risk of a crash.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
Dealers will replace the fittings and hoses in the affected valves, free of charge. Owner letters were mailed January 15, 2024. Owners may contact Kenworth's customer service at 1-425-828-5888 and Peterbilt's customer service at 1-940-591-4220. PACCAR's numbers for this recall are 23KWJ and 23PBJ.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
Affected vehicles
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Other campaigns involving Kenworth vehicles
Source: NHTSA recall database, campaign 23V661000 (manufacturer number 23KWJ, 23PBJ). Data last verified Jul 30, 2026.