PACCAR service campaign E338
What it saysCertain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIA’s manufacturing specifications. NHTSA’s full summary ↓
PACCAR filed this with NHTSA as a service campaign dated Apr 30, 2026, received May 6, 2026, about the engine. It names 36 model years across Kenworth and Peterbilt (2022–2025). 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 communicationCertain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIA’s manufacturing specifications.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| E338 | Service campaign | Apr 30, 2026 | 11032288 | PDF, 1,125 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 12 model years
Also filed against: 2022 Kenworth T680; 2023 Kenworth T680; 2024 Kenworth T680; 2025 Kenworth T680; 2022 Kenworth T880; 2023 Kenworth T880; 2024 Kenworth T880; 2025 Kenworth T880; 2022 Kenworth W990; 2023 Kenworth W990; 2024 Kenworth W990; 2025 Kenworth W990.
Peterbilt 24 model years
Also filed against: 2022 Peterbilt 365; 2023 Peterbilt 365; 2024 Peterbilt 365; 2025 Peterbilt 365; 2022 Peterbilt 367; 2023 Peterbilt 367; 2024 Peterbilt 367; 2025 Peterbilt 367; 2022 Peterbilt 389; 2023 Peterbilt 389; 2024 Peterbilt 389; 2025 Peterbilt 389; 2022 Peterbilt 520; 2023 Peterbilt 520; 2024 Peterbilt 520; 2025 Peterbilt 520; 2022 Peterbilt 567; 2023 Peterbilt 567; 2024 Peterbilt 567; 2025 Peterbilt 567; 2022 Peterbilt 579; 2023 Peterbilt 579; 2024 Peterbilt 579; 2025 Peterbilt 579.
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 engine
Source: same model, same component group18 other manufacturer communications filed against these PACCAR models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Kenworth list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| E340 | Emissions | Oct 16, 2026 | KW Certain vehicle model year 2026 Kenworth chassis equipped with EMY2025 PACCAR MX engines require an amended engine label. The engine labe… |
| P001 | Service campaign | Sep 11, 2026 | "KW: The chassis list has been updated to include 1 chassis. The total chassis count is now 53. A link to the PACCAR Powertrain Prognostics… |
| P003 | Service campaign | Sep 3, 2026 | "KW: A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to incl… |
| P002 | Service campaign | Sep 3, 2026 | "KW: A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to incl… |
| E316 | Service campaign | Aug 1, 2026 | 235 chassis have been removed from the chassis list and unflagged in PRWS due to expiration of applicable warranty coverage. 5 chassis have… |
| E335 | Emissions | Jul 18, 2026 | Expiration Date Format Update - Certain EPA21 compliant PACCAR MX-13 engines were built with intake valve springs that could fail. This fail… |
| CE033 | Warranty extension | Jun 25, 2026 | "KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this warranty policy." |
| CE031 | Warranty extension | Jun 24, 2026 | "KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this warranty policy." |
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 E338 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 E338 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 E338 cover?
The manufacturer filed it against 36 model years across 2 brands (Kenworth and Peterbilt): 2022 Kenworth T680, 2023 Kenworth T680, 2024 Kenworth T680, 2025 Kenworth T680, 2022 Kenworth T880, 2023 Kenworth T880 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.