Loy Cribbs

Sorry for late response, just saw the notification email. No I didn't & haven't had time to take it in to be programmed. Is this something I could do if I had a Tech 2 scanner?

Yes but without taking the spare tire down I can't say for sure that it was an OE GM part, pretty sure it was though.

Not sure about the relay, I think so, but definitely did on the others.

I can check with my son-in-law, he may have one. I have taken the plug apart, cleaned it up good, blew out with air hose, & put a new plug in the bumper.

The long time going "Service Trailer Brake System" on my 2012 2500hd LT 6.0 gas. I've replaced the relay the controller in the dash, the ITBC, & checked all the wires & can't find anything. Yet the message still shows up with a trailer connected or not & when the trailer is connected the brakes do not work. Took it to two local dealerships & both say tech didn't show or don't have time or something. I don't think they know how to fix it lol. Anyone have any ideas?