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December 1, 2007 Service bulletin

Headlamp flicker or momentarily dim while driving

Chevrolet technical service bulletin 4491 for 2004-2005 Chevrolet Trailblazer, 2004-2005 GMC Envoy and 2004 Oldsmobile Bravada and others.

Bulletin number
4491
Component
Exterior lighting: headlights
Summary
Headlamp flicker or momentarily dim while driving. 06-06-03-004 supplement. Short wheel base only. Nj updated 1/30/08. Nj

Owners of these vehicles have filed 373 complaints in the lights category.

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