Mack service campaign S4578 072025
What it saysSC - Mack Trucks has determined that certain AN models were assembled without a crossmember that was needed for the pusher axle. NHTSA’s full summary ↓
Mack filed this with NHTSA as a service campaign dated Jul 1, 2025, received Aug 4, 2025, about the structure. It names 1 model year (2026). 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 - Mack Trucks has determined that certain AN models were assembled without a crossmember that was needed for the pusher axle.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| S4578 072025 | Service campaign | Jul 1, 2025 | 11021343 | PDF, 236 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: 2026 Mack Anthem (an).
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 structure
Source: same model, same component group3 other manufacturer communications filed against the Mack Anthem (an) under the same component group (structure), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| S4373 022026 | Service campaign | Feb 26, 2026 | SC - Mack Trucks has determined that certain Mack sleeper cab assemblies were possibly manufactured with an insufficient number of welds acr… |
| S4548 202506 | Service campaign | Jun 1, 2025 | Mack Trucks has determined that certain model year 2020 to 2022 Anthem trucks could experience excessive wear on the hood latch pins causing… |
| S4373-202502 | Service campaign | Feb 28, 2025 | Mack Trucks has determined that certain Mack sleeper cab assemblies were possibly manufactured with an insufficient number of welds across t… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Mack, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mack S4578 072025 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 S4578 072025 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 S4578 072025 cover?
The manufacturer filed it against 1 model year: 2026 Mack Anthem (an). Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.