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2007 GMC Sierra 3500 HD Question: Service Trailer Brake System light came on without towing



Visitor, 6.6L V8 Diesel Turbo, Hagerstown, MD, July 23, 2010, 12:19

The servcie trailer brake system light just came on and i'm not towing anything.

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  • Answer #1

    Visitor, September 29, 2010, 23:49

    turn on the off tow haul mode on end of shifter

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    little deb, February 29, 2012, 11:07

    that all i have to do and the light will go off,the truck is a 2010 gmc sierra 2500 hd

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