Service bulletins for the 2025 Mack MD
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.
20 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
| S4325 072025 | 2025-08-04. Service campaign. ENGINE. CBR - Mack Trucks has identified that certain 2025 model year Mack Medium Duty (MMD) vehicles may have been assembled with insufficient torque on the fan hub retaining hardware. |
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| S4325 202412 | 2025-01-02. Service campaign. ENGINE. Mack Trucks has identified that certain 2025 model year Mack Medium Duty (MMD) vehicles may have been assembled with insufficient torque on the fan hub retaining hardware. To address this issue and maintain Mack's high-quality standards, please follow the instructions below to properly retorque the fan hub retaining hardware. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.