Western Star bulletin D24R2
Western Star filed this with NHTSA as a emissions communication dated Dec 3, 2024, received Jan 6, 2025, about the engine — 3 documents under this number: D24R2-OWN LTR, D24R2-DLR LTR, D24R2-Bulletin. It names 15 model years (2017–2024). 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 communicationEmission Recall for DETROIT DD13 and DD16 ACM Software Reprogramming
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| D24R2-OWN LTR | Emissions | Dec 3, 2024 | 11012368 | not yet checked |
| D24R2-DLR LTR | Emissions | Dec 3, 2024 | 11012367 | not yet checked |
| D24R2-Bulletin | Emissions | Dec 3, 2024 | 11012366 | 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: 2017 Western Star 4700; 2021 Western Star 47X; 2022 Western Star 47X; 2023 Western Star 47X; 2024 Western Star 47X; 2022 Western Star 4900; 2023 Western Star 4900; 2021 Western Star 49X; 2022 Western Star 49X; 2023 Western Star 49X; 2024 Western Star 49X; 2021 Western Star 57X; 2022 Western Star 57X; 2023 Western Star 57X; 2022 Western Star 6900.
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 Western Star D24R2 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 D24R2 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 D24R2 cover?
The manufacturer filed it against 15 model years: 2017 Western Star 4700, 2021 Western Star 47X, 2022 Western Star 47X, 2023 Western Star 47X, 2024 Western Star 47X, 2022 Western Star 4900 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.