Service bulletins for the 2004 Isuzu Ascender
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.
175 on file from NHTSA, as of 2026-10-19.
About C0550 on the 2004 Isuzu Ascender: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: C0550 are shown. Show all
| 0505001 | 2005-05-10. Service bulletin. ELECTRICAL SYSTEM. SERVICE 4WD LIGHT ON 4WD INOPERATIVE HARSH ENGAGEMENT OF 4WD NO COMMUNICATION WITH TCCM DTC C0550 SET. *EH |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.