Service bulletins for the 2018 Peterbilt 320
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.
28 on file from NHTSA, as of 2026-10-19.
By type
By component
By topic
| 42-056 | 2019-09-05. Service bulletin. ENGINE AND ENGINE COOLING. Fix-As-Fail -“ Composite fittings used in the cooling system may crack, resulting in coolant leaks. Brass fittings are available to replace the composite fittings. |
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| 42-058 | 2019-09-05. Service bulletin. ENGINE AND ENGINE COOLING. Fix-As-Fail: Two separate causes have been identified as root cause of intermittent low coolant indicator illumination. |
| 34-066 | 2019-07-08. Service bulletin. ELECTRICAL SYSTEM. Information Only - Quick Reference Guide for Electric harness damage repairs. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.