PACCAR bulletin E326
What it saysEPA 17-21 MX-13 Fuel Injector Connector SRTs have been added to the SRT tables in PRWS for replacement of the injector connector shells NHTSA’s full summary ↓
PACCAR filed this with NHTSA as an emissions communication dated Apr 1, 2026, received Feb 5, 2026, about the engine — 3 documents under this number. It names 80 model years across Kenworth, Peterbilt and Paccar (2016–2026). An emissions communication 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 · Paccar.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationEPA 17-21 MX-13 Fuel Injector Connector SRTs have been added to the SRT tables in PRWS for replacement of the injector connector shells
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| E326 | Emissions | Apr 1, 2026 | 11032284 | PDF, 626 KB |
| E326 | Emissions | Mar 6, 2026 | 11030922 | PDF, 600 KB |
| E326 | Emissions | Jan 15, 2026 | 11028309 | PDF, 721 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 32 model years
Also filed against: 2024 Kenworth L770; 2025 Kenworth L770; 2026 Kenworth L770; 2017 Kenworth T680; 2018 Kenworth T680; 2019 Kenworth T680; 2020 Kenworth T680; 2021 Kenworth T680; 2022 Kenworth T680; 2023 Kenworth T680; 2024 Kenworth T680; 2025 Kenworth T680; 2026 Kenworth T680; 2017 Kenworth T880; 2018 Kenworth T880; 2019 Kenworth T880; 2020 Kenworth T880; 2021 Kenworth T880; 2022 Kenworth T880; 2023 Kenworth T880; 2024 Kenworth T880; 2025 Kenworth T880; 2026 Kenworth T880; 2018 Kenworth W990; 2019 Kenworth W990; 2020 Kenworth W990; 2021 Kenworth W990; 2022 Kenworth W990; 2023 Kenworth W990; 2024 Kenworth W990; 2025 Kenworth W990; 2026 Kenworth W990.
Peterbilt 42 model years
Also filed against: 2017 Peterbilt 389; 2018 Peterbilt 389; 2019 Peterbilt 389; 2020 Peterbilt 389; 2021 Peterbilt 389; 2022 Peterbilt 389; 2023 Peterbilt 389; 2024 Peterbilt 389; 2025 Peterbilt 389; 2017 Peterbilt 520; 2018 Peterbilt 520; 2019 Peterbilt 520; 2020 Peterbilt 520; 2021 Peterbilt 520; 2022 Peterbilt 520; 2023 Peterbilt 520; 2024 Peterbilt 520; 2025 Peterbilt 520; 2026 Peterbilt 520; 2017 Peterbilt 567; 2018 Peterbilt 567; 2019 Peterbilt 567; 2020 Peterbilt 567; 2021 Peterbilt 567; 2022 Peterbilt 567; 2023 Peterbilt 567; 2024 Peterbilt 567; 2025 Peterbilt 567; 2026 Peterbilt 567; 2017 Peterbilt 579; 2018 Peterbilt 579; 2019 Peterbilt 579; 2020 Peterbilt 579; 2021 Peterbilt 579; 2022 Peterbilt 579; 2023 Peterbilt 579; 2024 Peterbilt 579; 2025 Peterbilt 579; 2026 Peterbilt 579; 2024 Peterbilt 589; 2025 Peterbilt 589; 2026 Peterbilt 589.
Paccar 6 model years
Also filed against: 2016 Paccar MX-13; 2017 Paccar MX-13; 2018 Paccar MX-13; 2019 Paccar MX-13; 2020 Paccar MX-13; 2021 Paccar MX-13.
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 group21 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… |
| 41-028 | Service campaign | Sep 5, 2026 | The campaign expiration date has been extended from 10/01/2026 to 04/01/2027. |
| 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." |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Kenworth, Peterbilt and Paccar, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is PACCAR E326 a recall?
No. A emissions communication 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 E326 repair free?
A emissions communication 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 E326 cover?
The manufacturer filed it against 80 model years across 3 brands (Kenworth, Peterbilt and Paccar): 2024 Kenworth L770, 2025 Kenworth L770, 2026 Kenworth L770, 2017 Kenworth T680, 2018 Kenworth T680, 2019 Kenworth T680 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.