I have a 07 2500HD with the built-in electric brake controller. When I connect the CM Drover GN horse trailer the truck does not recognize the trailer is there unless it is running when I plug the the trailer in. All the lights work on the trailer but not the brakes until you unplug the trailer and plug it back up.
If you cut the truck off and restart it , the truck goes back to not recognizing the trailer is connected. Then I have to unplug the trailer and plug it back up to get the trailer brakes to work.
Anybody else have this problem?