Peterbilt 536, model year 2021. Filed by PACCAR Incorporated and reported to NHTSA on 16 March 2021. 1 vehicles potentially affected.
What the notice says PACCAR Incorporated (PACCAR) is recalling one 2021 Peterbilt 536 vehicle equipped with a Cummins Westport Inc. B6.7N engine that has certain engine control module calibrations. The engine control module software may be calibrated incorrectly, causing the engine to not limit engine speed or torque as intended for …
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: 21PBC. That is the number on the owner letter and on the dealer paperwork. 21V181 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 21V181 cover?
- Peterbilt 536, model year 2021.
- What is wrong with them?
- PACCAR Incorporated (PACCAR) is recalling one 2021 Peterbilt 536 vehicle equipped with a Cummins Westport Inc. B6.7N engine that has certain engine control module calibrations.
- What can happen if it is not put right?
- If safety-related functions such as vehicle braking, stability, speed, and collision avoidance do not function properly, it can increase the risk of a crash.
- Is there a fix yet?
- PACCAR owns the vehicle affected, and it was repaired as of March 3, 2021. Owners may contact PACCAR customer service at 1-940-591-4220. PACCAR's number for this recall is 21PBC.
- 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 21PBC, 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 safety-related functions such as vehicle braking, stability, speed, and collision avoidance do not function properly, it can increase the risk of a crash.”
affected
in the notice
caught
| Campaign | 21V181 |
|---|---|
| Filed by | PACCAR Incorporated |
| System at fault | Engine |
| Reported to NHTSA | 16 March 2021 |
| Model years | 2021-2021 |
| Vehicles named | PETERBILT 536 |
What the notice says today
The consequence
If safety-related functions such as vehicle braking, stability, speed, and collision avoidance do not function properly, it can increase the risk of a crash.
The remedy
PACCAR owns the vehicle affected, and it was repaired as of March 3, 2021. Owners may contact PACCAR customer service at 1-940-591-4220. PACCAR's number for this recall is 21PBC.
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 116 notices in the record whose component field names engine. Across that group the median wait before owners were written to was 50 days.
The models named here, across their whole recall history
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 21V181 on 23 August 2026, they were:
- Defect summary
312a2fc5 - Consequence
2ca512be - Remedy
fe90ca6e
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 21V181 · how the whole register is watched
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