Service bulletins for the 2021 Peterbilt 378
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.
13 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Steering are shown. Show all
| 15-029 | 2021-06-02. Service bulletin. STEERING. Information Only - Power steering reservoir cap may separate during removal when it is pulled upward instead of twisted. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.