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Service Trailer Brake System light came on without towing

(2007 GMC Sierra 3500 HD)
in Hagerstown, MD on July 23, 2010
The servcie trailer brake system light just came on and i'm not towing anything.
Displaying 1 answers & 1 comments
Popular Answer
on September 29, 2010
turn on the off tow haul mode on end of shifter
on February 29, 2012
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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