2007 GMC Sierra 3500 HD Q&A

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

The servcie trailer brake system light just came on and i'm not towing anything. -
Answer 1
turn on the off tow haul mode on end of shifter -
Comment 1
that all i have to do and the light will go off,the truck is a 2010 gmc sierra 2500 hd -