Service bulletins for the 2025 Mack Pioneer
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
155 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
Only bulletins with type: Service campaign are shown. Show all
| S4866 032026 | 2026-04-02. Service campaign. STRUCTURE:BODY. SC - Load Lock Clamp Install |
|---|---|
| S4808 032026 | 2026-04-02. Service campaign. STRUCTURE:BODY. SC - Certain model PR’s could experience grille surround trim detaching due to insufficient retention. |
| S4757 022026 | 2026-03-03. Service campaign. ENGINE. SC - Certain model AN(4)’s and PR’s could experience DEF leaks or crystallization due to the installation of incorrect fasteners for the Urea Dosage Valve. |
| SC S4742 202601 | 2026-02-03. Service campaign. ENGINE. CBR MCO/VECI Label Reprint. |
| S4373-202502 | 2025-03-03. Service campaign. STRUCTURE:BODY; UNKNOWN OR OTHER. Mack Trucks has determined that certain Mack sleeper cab assemblies were possibly manufactured with an insufficient number of welds across the rear flange of the upper header. The reduced number of welds could lower the designed cab integrity. |
| S0285 202410 | 2024-11-04. Service campaign. STEERING. SERVICE CAMPAIGN - Pitman Arm Pinch Bolt Alignment |
| S4088 202409 | 2024-10-04. Service campaign. POWER TRAIN. Service Campaign: Interaxle Driveline Torque |
| S0488 202407 | 2024-08-01. Service campaign. POWER TRAIN. Service Campaign: Interaxle Driveline Torque |
| S3949 202406 | 2024-07-03. Service campaign. STEERING. SC - Steering Stub Shaft Hardware Replacement |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.