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Service bulletin 020601026

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 id634784
Published by NHTSA2002-10-09
Manufacturer's number020601026
Manufacturer's date2002-06-01
NHTSA componentUNKNOWN OR OTHER

NHTSA's summary

SUBJECT REGARDING ENGINE IDENTIFICATION INFORMATION FOR 2003 AND PRIOR PASSENGER CARS AND TRUCKS AND 2003 HUMMER H2 WITH NORTH AMERICAN ENGINES. *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.

Vehicles listed
AM GENERAL HUMMER2003
BUICK BUICK2003
CADILLAC CADILLAC2003
CHEVROLET CHEVROLET2003
GMC GMC2003
ISUZU ISUZU TRUCK2003
OLDSMOBILE OLDSMOBILE2003

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