WenmarOpen by Wenmar Pro

Service bulletin 040604075

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10012721
Published by NHTSA2005-03-12
Manufacturer's number040604075
Manufacturer's date2004-10-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

CHECK ENGINE LIGHT ILLUMINATED, DIAGNOSTIC TROUBLE CODE (DTC) P0400 SET. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Trouble codes named

P0400

Vehicles listed
CHEVROLET W35002005
CHEVROLET W45002005
CHEVROLET W55002005
GMC W35002005
GMC W45002005
GMC W55002005
ISUZU NPR2005

Listing a model year does not mean every vehicle of it is concerned: the document says which.