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October 1, 2007 Service bulletin

Automatic headlights inoperative until shifter is placed into gear

Chevrolet technical service bulletin 4520 for 2006 Chevrolet Trailblazer, 2006 GMC Envoy and 2006 Chevrolet Trailblazer EXT and others.

Bulletin number
4520
Component
Exterior lighting: headlights
Summary
Automatic headlights inoperative until shifter is placed into gear. Nj

Owners of these vehicles have filed 233 complaints in the lights category.

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