Kenworth T280, Kenworth T380, Kenworth T480, Peterbilt 536, Peterbilt 537, Peterbilt 548, model years 2020 to 2024. Filed by PACCAR Incorporated and reported to NHTSA on 29 September 2023. 254 vehicles potentially affected.
What the notice says 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 …
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
What owners ask about this recall
- Which vehicles does recall 23V661 cover?
- Kenworth T280, Kenworth T380, Kenworth T480, Peterbilt 536, Peterbilt 537, Peterbilt 548, model years 2020-2024.
- What is wrong with them?
- 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.
- What can happen if it is not put right?
- A delay in the trailer brake release can create instability to the trailer and increase the risk of a crash.
- Is there a fix yet?
- Yes, and it is free. 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.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “A delay in the trailer brake release can create instability to the trailer and increase the risk of a crash.”
affected
in the notice
caught
| Campaign | 23V661 |
|---|---|
| Filed by | PACCAR Incorporated |
| System at fault | Service Brakes, Air |
| Reported to NHTSA | 29 September 2023 |
| Model years | 2020-2024 |
| Vehicles named | KENWORTH T280, KENWORTH T380, KENWORTH T480, PETERBILT 536, PETERBILT 537, PETERBILT 548 |
What the notice says today
The consequence
A delay in the trailer brake release can create instability to the trailer and increase the risk of a crash.
The remedy
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.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 353 notices in the record whose component field names service brakes, air. Across that group the median wait before owners were written to was 43 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
- Kenworth T280 recalls: 19 US campaigns
- Kenworth T380 recalls: 19 US campaigns
- Kenworth T480 recalls: 21 US campaigns
- Peterbilt 536 recalls: 21 US campaigns
- Peterbilt 537 recalls: 19 US campaigns
- Peterbilt 548 recalls: 22 US campaigns
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 23V661, wording as read on 16 September 2026. https://carsmultiverse.com/recall/23v661/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Paccar notices we hold
- 26V544: 2027 Peterbilt 567, 579, 589 and 2027 Kenworth T680, T880, and W990
- 26V485: 2027 Peterbilt and Kenworth
- 26V442: 2026-2027 Peterbilt 579 and 2027 Kenworth T680 tractors
- 26V022: 2026 Kenworth L770 and 2024-2026 Peterbilt 520
- 25V795: 2026 Peterbilt 567 and 589 trucks
- 25V569: 2024-2026 Kenworth T680, T880, and W990 trucks
- 25V353: 2024 Peterbilt 367, 2026 Peterbilt 548, 589, and 2024-2026 Peterbilt 567 trucks
- 25V182: 2021-2026 Peterbilt 220, 2022-2026 Kenworth K370, and 2020-2026 K270 Medium-Duty Battery Electric
All 138 Paccar campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 23V661 on 5 September 2026, they were:
- Defect summary
75841fa6 - Consequence
c14c798d - Remedy
9153c9a3
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 23V661 · how the whole register is watched
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