Service bulletins for the 2003 Dodge Ram
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.
111 on file from NHTSA, as of 2026-10-19.
About P0421 on the 2003 Dodge Ram: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
By topic
Only bulletins with trouble code: P0421 are shown. Show all
| 10182004 | 2005-04-27. Service bulletin. ELECTRICAL SYSTEM. ADDED DIAGNOSTICS FOR P0421 AND P0431. *EH |
|---|
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.