Paccar bulletin E327
What it says"PSB E327: PACCAR MX-11 and MX-13 OBD Software Update Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash STOP lamp incorrectly. NHTSA’s full summary ↓
Paccar filed this with NHTSA as an emissions communication dated Feb 27, 2025, received Mar 4, 2025, about the engine. It names 4 model years (2020–2021). 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communication"PSB E327: PACCAR MX-11 and MX-13 OBD Software Update 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 | 11014767 | PDF, 172 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 themAlso filed against: 2020 Paccar MX-11; 2021 Paccar MX-11; 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 group4 other manufacturer communications filed against these Paccar models under the same component group (engine), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 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… |
| E326 | Emissions | Apr 1, 2026 | EPA 17-21 MX-13 Fuel Injector Connector SRTs have been added to the SRT tables in PRWS for replacement of the injector connector shells |
| E273 | Emissions | Aug 22, 2025 | Fix As Fail Part number 2200138 DPF Pressure Sensor has been added to the parts table for the following PACCAR MX engines: •EMY2021 MX13-1… |
| E321 | Emissions | Mar 1, 2025 | Certain chassis equipped with a PACCAR MX-11 EMY18 engine are eligible to receive software improvements to increase vehicle uptime and funct… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Paccar, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Paccar 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 4 model years: 2020 Paccar MX-11, 2021 Paccar MX-11, 2020 Paccar MX-13, 2021 Paccar MX-13. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.