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Service bulletin 020421002

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 id629356
Published by NHTSA2002-04-02
Manufacturer's number020421002
Manufacturer's date2002-02-01
NHTSA componentUNKNOWN OR OTHER

NHTSA's summary

SOME OWNERS MAY COMMENT ON THE SERVICE 4WD INDICATOR ILLUMINATING, IN ADDITION TO DIAGNOSTIC TROUBLE CODE B2725. *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.

Trouble codes named

B2725

Vehicles listed
CHEVROLET TRAILBLAZER2002
GMC ENVOY2002

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