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Service bulletin 04031

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 id10006859
Published by NHTSA2004-05-18
Manufacturer's number04031
Manufacturer's date2004-05-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

INSUFFICIENT GROUND TO THE OIL PRESSURE SWITCH, PREVENTING THE ENGINE OIL PRESSURE WARNING LIGHT FROM ILLUMINATING WHEN THE VEHICLE IS STARTED AND WHEN THE ENGINE OIL PRESSURE FALLS BELOW NORMAL. ALSO INCLUDES GMC AND CHEVROLET W3500/3500 SERIES ISUZU AND NPR/HD 2004. *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

Vehicles listed
CHEVROLET W35002003
CHEVROLET W45002003
GMC W35002003
GMC W45002003
ISUZU NPR2003

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