Volvo service campaign S4370 202501
What it saysSC - Volvo Trucks has determined that certain VN 4 model trucks equipped with a D13 Turbo Compound (TC) engine may experience TC unit failure due to an under-torqued idler gear bracket. NHTSA’s full summary ↓
Volvo filed this with NHTSA as a service campaign dated Jan 1, 2025, received Feb 3, 2025, about the engine. It names 1 model year (2025). A service campaign 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 communicationSC - Volvo Trucks has determined that certain VN 4 model trucks equipped with a D13 Turbo Compound (TC) engine may experience TC unit failure due to an under-torqued idler gear bracket.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| S4370 202501 | Service campaign | Jan 1, 2025 | 11013459 | PDF, 178 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: 2025 Volvo VNL (4).
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 group8 other manufacturer communications filed against the Volvo VNL (4) under the same component group (engine), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| S4532 082026 | Service campaign | Aug 4, 2026 | CBR - Turbo Compound Double Idler Gear Replacement. |
| SC S4642 202601 | Service campaign | Jan 1, 2026 | SC - Front Engine Accessory Drive Update. |
| S4532 072025 | Service campaign | Jul 1, 2025 | SC - Volvo Trucks has determined that certain VN and VN 4 model trucks equipped with a D13 Turbo Compound (TC) engine may experience TC Doub… |
| S4463 202504 | Service campaign | Apr 2, 2025 | SC - Volvo Trucks North America has introduced enhanced Liner EATS (Exhaust Aftertreatment System) Mounting Straps for specific VN(4) and VN… |
| S4358 202501 | Service campaign | Jan 1, 2025 | SC - Volvo Trucks has identified that certain VN 4 model trucks equipped with a D13 Turbo Compound (TC) engine may be at risk of TC unit fa… |
| S4349 202501 | Service campaign | Jan 1, 2025 | SC - Volvo Trucks has determined that certain VN model trucks equipped with a D13 Turbo Compound (TC) engine may experience TC unit failure… |
| S4346 202501 | Service campaign | Jan 1, 2025 | SC - Volvo Trucks has identified that certain VN model trucks equipped with a D13 Turbo Compound (TC) engine may be at risk of TC unit fail… |
| S4308 202412 | Service campaign | Dec 19, 2024 | Volvo Trucks has identified that certain VN model trucks may encounter an issue with the EECU during a shutdown event. If this occurs, the E… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Volvo, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Volvo S4370 202501 a recall?
No. A service campaign 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 S4370 202501 repair free?
A service campaign 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 S4370 202501 cover?
The manufacturer filed it against 1 model year: 2025 Volvo VNL (4). Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.