Service bulletins for the 2026 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.
100 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
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Only bulletins with type: Service campaign are shown. Show all
| 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 S4751 202601 | 2026-02-03. Service campaign. ELECTRICAL SYSTEM. CBR - Driver Environment Control Module Replacement. |
| SC S4742 202601 | 2026-02-03. Service campaign. ENGINE. CBR MCO/VECI Label Reprint. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.