Peterbilt bulletin E327
Peterbilt filed this with NHTSA as a emissions communication dated Feb 27, 2025, received Mar 4, 2025, about the engine. It names 30 model years (2021–2025). 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 communication"Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash STOP lamp incorrectly. PCI-2 software on these chassis must be reverted from NA202 to NA201 (Pack 2 injectors) or from NA206 to NA191 (Pack 1 injectors) to prevent incorrect STOP lamp display.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| E327 | Emissions | Feb 27, 2025 | 11014768 | not yet checked |
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 themAlso filed against: 2021 Peterbilt 365; 2022 Peterbilt 365; 2023 Peterbilt 365; 2024 Peterbilt 365; 2025 Peterbilt 365; 2021 Peterbilt 367; 2022 Peterbilt 367; 2023 Peterbilt 367; 2024 Peterbilt 367; 2025 Peterbilt 367; 2021 Peterbilt 389; 2022 Peterbilt 389; 2023 Peterbilt 389; 2024 Peterbilt 389; 2025 Peterbilt 389; 2021 Peterbilt 520; 2022 Peterbilt 520; 2023 Peterbilt 520; 2024 Peterbilt 520; 2025 Peterbilt 520; 2021 Peterbilt 567; 2022 Peterbilt 567; 2023 Peterbilt 567; 2024 Peterbilt 567; 2025 Peterbilt 567; 2021 Peterbilt 579; 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.
Common questions
Source: NHTSA, 49 CFR 579.5Is Peterbilt E327 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 E327 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 E327 cover?
The manufacturer filed it against 30 model years: 2021 Peterbilt 365, 2022 Peterbilt 365, 2023 Peterbilt 365, 2024 Peterbilt 365, 2025 Peterbilt 365, 2021 Peterbilt 367 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.