2008 GMC Truck Light System

2008 GMC TRUCK
118,000 MILES • 4WD • AUTOMATIC
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MONTY77
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  • 1 POST
When the engine is started the head lights go out. I have no head light when the truck is in gear.
Aug 4, 2014 at 1:59 PM
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HMAC300
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  • 48,601 POSTS
I am assuming it works when not running. have it scanned for codes it may be a body module problem doing this.
Aug 5, 2014 at 6:28 AM