Service Trailer Brake System Gmc. Installing trailer brake controller on 2008 chevy express van cutaway chassis; When the pcm, brake controller and instrument cluster are unable to communicate with each other at any time while the ignition switch is turned to the run position, code u1900 sets in memory.
There is another problem involved with the integrated break system. You can get a service trailer brake system message if one of back tires slip. Hey guys, my info center is kicking up a service brake system warning.
I have a 2009 2500 gmc with factory intergrated trailer brake system.
I replaced the controller and the message still comes up. When the pcm, brake controller and instrument cluster are unable to communicate with each other at any time while the ignition switch is turned to the run position, code u1900 sets in memory. After about 6 months of ownership the service trailer brake system light came on. All of the lights and turn signals work, but no brakes.