PACCAR service campaign 25PACF
What it saysProcedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013. NHTSA’s full summary ↓
PACCAR filed this with NHTSA as a service campaign dated Dec 23, 2025, received Sep 3, 2025, about the exterior lighting — 2 documents under this number. It names 60 model years across Kenworth and Peterbilt (2023–2026). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
One page for every brand it was filed under. Each brand’s bulletins: Kenworth · Peterbilt.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013. Parts and procedures for Phase 2 chassis will be available at a later date. This bulletin will be updated at that time. Please refer to the condition section for more details. Certain Ethernet Multiplexed Architecture (EMUX) chassis fail to conform to Federal and Canada Motor Vehicle Safety Standards (FMVSS/CMVSS) No. 108. Delayed or unsteady illumination of the vehicle’s stop lamps, reverse lamps, turn signal lamps and inadvertent change in headlamp illumination or lift axle position may"
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 25PACF | Service bulletin | Dec 23, 2025 | 11027067 | PDF, 1,073 KB |
| 25PACF | Service campaign | Aug 1, 2025 | 11022490 | PDF, 719 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themKenworth 30 model years
Also filed against: 2024 Kenworth L770; 2025 Kenworth L770; 2026 Kenworth L770; 2023 Kenworth T180; 2024 Kenworth T180; 2025 Kenworth T180; 2023 Kenworth T280; 2024 Kenworth T280; 2025 Kenworth T280; 2026 Kenworth T280; 2023 Kenworth T380; 2024 Kenworth T380; 2025 Kenworth T380; 2026 Kenworth T380; 2023 Kenworth T480; 2024 Kenworth T480; 2025 Kenworth T480; 2026 Kenworth T480; 2023 Kenworth T680; 2024 Kenworth T680; 2025 Kenworth T680; 2026 Kenworth T680; 2023 Kenworth T880; 2024 Kenworth T880; 2025 Kenworth T880; 2026 Kenworth T880; 2023 Kenworth W990; 2024 Kenworth W990; 2025 Kenworth W990; 2026 Kenworth W990.
Peterbilt 30 model years
Also filed against: 2023 Peterbilt 520; 2024 Peterbilt 520; 2025 Peterbilt 520; 2026 Peterbilt 520; 2023 Peterbilt 535; 2024 Peterbilt 535; 2025 Peterbilt 535; 2023 Peterbilt 536; 2024 Peterbilt 536; 2025 Peterbilt 536; 2026 Peterbilt 536; 2023 Peterbilt 537; 2024 Peterbilt 537; 2025 Peterbilt 537; 2026 Peterbilt 537; 2023 Peterbilt 548; 2024 Peterbilt 548; 2025 Peterbilt 548; 2026 Peterbilt 548; 2023 Peterbilt 567; 2024 Peterbilt 567; 2025 Peterbilt 567; 2026 Peterbilt 567; 2023 Peterbilt 579; 2024 Peterbilt 579; 2025 Peterbilt 579; 2026 Peterbilt 579; 2024 Peterbilt 589; 2025 Peterbilt 589; 2026 Peterbilt 589.
None of these model years has a page on this site (it covers EPA-certified cars, trucks and SUVs from 2016), so the bulletin is listed here on its own.
More bulletins about the exterior lighting
Source: same model, same component group1 other manufacturer communication filed against these PACCAR models under the same component group (exterior lighting), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 34-100 | Service campaign | Mar 28, 2026 | Halogen Headlamp Operation -Activating the Flash to Pass system on certain [Kenworth / Peterbilt] vehicles may cause one headlamp to deacti… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Kenworth and Peterbilt, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is PACCAR 25PACF a recall?
No. A service campaign is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls.
Is the 25PACF repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does 25PACF cover?
The manufacturer filed it against 60 model years across 2 brands (Kenworth and Peterbilt): 2024 Kenworth L770, 2025 Kenworth L770, 2026 Kenworth L770, 2023 Kenworth T180, 2024 Kenworth T180, 2025 Kenworth T180 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: built 27 May 2022 – 23 May 2025 — the build date is on the certification label in the driver’s door jamb.