Service bulletins for the 2021 Peterbilt 340
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.
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By component
Only bulletins with component: Fuel system are shown. Show all
| 43-071 | 2021-10-05. Service bulletin. FUEL SYSTEM, DIESEL. Fix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are available. As a temporary solution, after PACCAR confirms a DEF sensor is not available, a temporary software update will allow a vehicle to continue operation with a failed DEF sensor by disabling the DEF sensor diagnostics. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.