Daimler Truck bulletin D24R2
What it saysFor DETROIT DD13 and DD16 ACM Software Reprogramming NHTSA’s full summary ↓
Daimler Truck filed this with NHTSA as an 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 26 model years across Freightliner and Western Star (2016–2024). 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.
One page for every brand it was filed under. Each brand’s bulletins: Freightliner · Western Star.
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 | PDF, 664 KB |
| D24R2-DLR LTR | Emissions | Dec 3, 2024 | 11012367 | PDF, 664 KB |
| D24R2-Bulletin | Emissions | Dec 3, 2024 | 11012366 | PDF, 664 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 themFreightliner 11 model years
Also filed against: 2021 Freightliner 114SD; 2022 Freightliner 114SD; 2023 Freightliner 114SD; 2024 Freightliner 114SD; 2022 Freightliner Business Class M2; 2023 Freightliner Business Class M2; 2016 Freightliner Cascadia; 2021 Freightliner Cascadia; 2022 Freightliner Cascadia; 2023 Freightliner Cascadia; 2024 Freightliner Cascadia.
Western Star 15 model years
Also 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.
More bulletins about the engine
Source: same model, same component group13 other manufacturer communications filed against these Daimler Truck models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Freightliner list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TITANX EXTENSION | Warranty extension | Feb 4, 2026 | Standard Warranty Extension for vehicles with TitanX Radiators |
| F1015 | Emissions | Nov 14, 2025 | Revised Emissions Recall for VECI Label Emissions Recall |
| SF715 | Service campaign | Aug 29, 2025 | Field Service campaign for stalk switches |
| SF716 | Service campaign | May 23, 2025 | Field Service Campaign for DEF Regen Inhibit Dash Switch Indicator |
| F1014 | Emissions | Mar 25, 2025 | Emission recall for Western Star DEF Header |
| D24R7 | Emissions | Jan 31, 2025 | Emission Recall for DD8 EGR Monitor Software Reprogramming |
| D24M5 | Service campaign | Jan 30, 2025 | Detroit Field Service campaign for 2024 HDEP ACM Software Reprogramming. |
| D24R4 | Emissions | Nov 27, 2024 | Detroit Emission recall for GHG14 DETROIT DD16 Software Reprogramming |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Freightliner and Western Star, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Daimler Truck 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 26 model years across 2 brands (Freightliner and Western Star): 2021 Freightliner 114SD, 2022 Freightliner 114SD, 2023 Freightliner 114SD, 2024 Freightliner 114SD, 2022 Freightliner Business Class M2, 2023 Freightliner Business Class M2 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.