Peterbilt 367, Peterbilt 389, Peterbilt 567, Peterbilt 579, model years 2021 to 2022. Filed by PACCAR Incorporated and reported to NHTSA on 19 August 2021. 163 vehicles potentially affected.
What the notice says PACCAR, Inc. (PACCAR) is recalling certain 2021-2022 Peterbilt 367, 389, 567, and 579 vehicles. The cross member mounted Hill Start Assist valve assembly may have insufficient clearance to the rear axle, causing damage to the rear brake hose and loss of the rear brake signal.
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.
Paccar's own number for this recall: 21PBJ. That is the number on the owner letter and on the dealer paperwork. 21V648 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 21V648 cover?
- Peterbilt 367, Peterbilt 389, Peterbilt 567, Peterbilt 579, model years 2021-2022.
- What is wrong with them?
- PACCAR, Inc. (PACCAR) is recalling certain 2021-2022 Peterbilt 367, 389, 567, and 579 vehicles. The cross member mounted Hill Start Assist valve assembly may have insufficient clearance to the rear axle, causing damage to the rear brake hose and loss of the rear brake signal.
- What can happen if it is not put right?
- If loss of the rear brake signal occurs, the vehicle could experience reduced rear braking capability or loss of brakes to the rear axle(s), increasing the risk of a crash.
- Is there a fix yet?
- Yes, and it is free. Dealers will inspect for clearance and re-work the assembly to conform with an updated design, free of charge. Interim owner notification letters were mailed on September 24, 2021. Owner notification letters were mailed on March 11, 2022.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Paccar calls this recall 21PBJ, which is the number on the owner letter and the dealer paperwork.
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: “If loss of the rear brake signal occurs, the vehicle could experience reduced rear braking capability or loss of brakes to the rear axle(s), increasing the risk of a crash.”
affected
in the notice
caught
| Campaign | 21V648 |
|---|---|
| Filed by | PACCAR Incorporated |
| System at fault | Service Brakes, Hydraulic:Foundation Components:Hoses, Lines/Piping, And Fittings |
| Reported to NHTSA | 19 August 2021 |
| Model years | 2021-2022 |
| Vehicles named | PETERBILT 367, PETERBILT 389, PETERBILT 567, PETERBILT 579 |
What the notice says today
The consequence
If loss of the rear brake signal occurs, the vehicle could experience reduced rear braking capability or loss of brakes to the rear axle(s), increasing the risk of a crash.
The remedy
Dealers will inspect for clearance and re-work the assembly to conform with an updated design, free of charge. Interim owner notification letters were mailed on September 24, 2021. Owner notification letters were mailed on March 11, 2022. Owners may contact PACCAR's customer service at 1-940-591-4220 (Peterbilt). PACCAR's number for this recall is 21PBJ.
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 583 notices in the record whose component field names service brakes, hydraulic. Across that group the median wait before owners were written to was 37 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
- Peterbilt 367 recalls: 41 US campaigns
- Peterbilt 389 recalls: 40 US campaigns
- Peterbilt 567 recalls: 57 US campaigns
- Peterbilt 579 recalls: 59 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 21V648, wording as read on 16 September 2026. https://carsmultiverse.com/recall/21v648/
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 21V648 on 23 August 2026, they were:
- Defect summary
b82cf2bc - Consequence
b7ecbfd0 - Remedy
81ed8284
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 21V648 · how the whole register is watched
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