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Service bulletin 4491

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 id10023137
Published by NHTSA2007-10-29
Manufacturer's number4491
Manufacturer's date2007-12-01
Replaces4491B
NHTSA componentEXTERIOR LIGHTING:HEADLIGHTS

NHTSA's summary

HEADLAMP FLICKER OR MOMENTARILY DIM WHILE DRIVING. 06-06-03-004 SUPPLEMENT. SHORT WHEEL BASE ONLY. *NJ UPDATED 1/30/08. *NJ

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

Lighting, Headlights

Vehicles listed
BUICK RAINIER2004, 2005
CHEVROLET TRAILBLAZER2004, 2005
GMC ENVOY2004, 2005
OLDSMOBILE BRAVADA2004

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

Other bulletins for the same vehicles and component
02-08-42-001I2017-08-31. Service bulletin. This informational bulletin provides an out line on Headlamp, Tail Lamp, License Lamp or Fog/Driving Lamp Damage and what should be considered warranty replacement and not
01-08-42-001K2017-08-31. Service bulletin. This informational bulletin provides information on exterior lamp condinsation and replacement guidelines
3170E2006-02-16. Service bulletin. IPC, INTERIOR LIGHTS AND/OR HEADLAMPS FLICKER. *AK FB2
0508420052005-11-03. Service bulletin. INFORMATION ON VERTICAL REFLECTION FROM HEADLAMPS WHEN USING HIGH BEAMS IN DENSE FOG. *TT UPDATED 04-04-07. *KB
36802005-09-21. Service bulletin. AUTOMATIC HEADLAMP DEFEAT INOPERATIVE AFTER BCM REPLACEMENT. *TT
0508420012005-05-14. Service bulletin. DIAGNOSTIC INFORMATION ON HEADLAMPS FLICKER OR MOMENTARILY DIM WHILE DRIVING. *TT
3317A2005-04-20. Service bulletin. HEADLAMPS FLICKER OR DIM WHILE DRIVING. *TT
30442004-10-14. Service bulletin. LOCATION OF THE HEADLAMP DRIVER MODULE (HDM). *TT