Mack service campaign S3949 202406
What it saysSC - Steering Stub Shaft Hardware Replacement NHTSA’s full summary ↓
Mack filed this with NHTSA as a service campaign dated Jun 3, 2024, received Jul 3, 2024, about the steering. It names 4 model years (2024–2025). 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 - Steering Stub Shaft Hardware Replacement
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| S3949 202406 | Service campaign | Jun 3, 2024 | 11003045 | PDF, 775 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: 2024 Mack Granite (gr); 2025 Mack Granite (gr); 2024 Mack Pinnacle (pi/pn); 2025 Mack Pioneer PR (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 steering
Source: same model, same component group3 other manufacturer communications filed against these Mack models under the same component group (steering), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| S4584 092025 | Service campaign | Sep 1, 2025 | The vehicle’s steering shaft support bracket may have been assembled with incorrect hardware. |
| S0285 202410 | Service campaign | Oct 1, 2024 | SERVICE CAMPAIGN - Pitman Arm Pinch Bolt Alignment |
| S3284 202408 | Service campaign | Aug 24, 2024 | Service Campaign: Mack trucks has determined that certain AN, GR, and PI models were built using the incorrect power steering cooler hose c… |
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 S3949 202406 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 S3949 202406 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 S3949 202406 cover?
The manufacturer filed it against 4 model years: 2024 Mack Granite (gr), 2025 Mack Granite (gr), 2024 Mack Pinnacle (pi/pn), 2025 Mack Pioneer PR (4). Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.