Service bulletins for the 2023 Peterbilt 520
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.
50 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with type: Warranty extension are shown. Show all
| CE033 | 2026-07-02. Warranty extension. ENGINE; POWER TRAIN. "KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this warranty policy." |
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| CE033 | 2025-08-05. Warranty extension. ENGINE. 32 fuel injector part numbers (16 for MX-11 and 16 for MX-13) have been added to this warranty policy. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.