Peterbilt bulletin E334
Peterbilt filed this with NHTSA as a emissions communication dated Dec 13, 2025, received Jan 6, 2026, about the engine. It names 5 model years (2022). A 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationCertain vehicle model year 2022 Kenworth chassis equipped with Engine Model Year (EMY) 2021 PACCAR MX engines may have an exempt engine label installed.
Document filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| E334 | Emissions | Dec 13, 2025 | 11027061 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5; the full text comes from the manufacturer or a dealer. 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. Quote it at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themAlso filed against: 2022 Peterbilt 320; 2022 Peterbilt 389; 2022 Peterbilt 520; 2022 Peterbilt 567; 2022 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.
Common questions
Source: NHTSA, 49 CFR 579.5Is Peterbilt E334 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 E334 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 E334 cover?
The manufacturer filed it against 5 model years: 2022 Peterbilt 320, 2022 Peterbilt 389, 2022 Peterbilt 520, 2022 Peterbilt 567, 2022 Peterbilt 579. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.