WenmarOpen by Wenmar Pro

Service bulletin 040601005

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 id10008660
Published by NHTSA2004-08-13
Manufacturer's number040601005
Manufacturer's date2004-10-01
Replaces040601005A
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

5.2L 4HK1 DIESEL ENGINE QUALITY MONITOR/PARTS TECHNICAL MAC CODE/EXCHANGE PROGRAM. *TT UPDATE. *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 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.