PACCAR warranty extension CE037
What it saysKW & PB DEF Quality Sensor part number Q21-6127-001 for Cummins X15 engines has been added to this warranty policy. NHTSA’s full summary ↓
PACCAR filed this with NHTSA as a warranty extension dated Apr 17, 2026, received May 6, 2026, about the fuel/propulsion system. It names 8 model years across Kenworth and Peterbilt (2020). A warranty extension 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 communicationKW & PB DEF Quality Sensor part number Q21-6127-001 for Cummins X15 engines has been added to this warranty policy.
One of the 432 warranty extensions and special-coverage programs on file — every make, with the term each runs to.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| CE037 | Warranty extension | Apr 17, 2026 | 11032292 | PDF, 474 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 5 model years
Also filed against: 2020 Kenworth T680; 2020 Kenworth T800; 2020 Kenworth T880; 2020 Kenworth W900; 2020 Kenworth W990.
Peterbilt 3 model years
Also filed against: 2020 Peterbilt 389; 2020 Peterbilt 567; 2020 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 fuel/propulsion system
Source: same model, same component group1 other manufacturer communication filed against these PACCAR models under the same component group (fuel/propulsion system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| CE036 | Warranty extension | Apr 17, 2026 | KW & PB DEF Quality Sensor part number Q21-6127-001 for PACCAR PX-7 and Cummins X15 engines has 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 CE037 a recall?
No. A warranty extension 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 CE037 repair free?
A warranty extension 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 CE037 cover?
The manufacturer filed it against 8 model years across 2 brands (Kenworth and Peterbilt): 2020 Kenworth T680, 2020 Kenworth T800, 2020 Kenworth T880, 2020 Kenworth W900, 2020 Kenworth W990, 2020 Peterbilt 389 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.