trailer

In 2014, I ordered a 2015 GMC Sierra to be my main vehicle and tow my travel trailer. It was ordered with the trailer tow package with max towing, integrated trailer brake controller, trailer mirrors, etc. All was good for the first two years. In September 2017, we went on a long trip to South...

I have a 2013 Sierra 1500, 5.3. It has the factory trailer brake control. Yesterday, I tried hooking up to my trailer. It says "Trailer Connected" on the DIC, but will not read the "Output"....just showing 6 dashed lines (- - - - - -). The trailer brakes will not engage. The trailer breaks...