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Service bulletin 15WT02

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 id634280
Published by NHTSA2002-09-28
Manufacturer's number15WT02
Manufacturer's date2002-05-01
NHTSA componentELECTRICAL SYSTEM:IGNITION:MODULE

NHTSA's summary

SUBJECT REGARDING NEW ELECTRONIC CONTROL UNITS, V9B CONTROLS SOFTWARE, AND NEW TRANSMISSION CALIBRATIONS FOR THE WORLD TRANSMISSION MODELS, ALL WORLD TRANSMISSION MODELS.*JB

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

Electrical system, Ignition

Vehicles listed
GMC GM

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