Posted: 3/26/2016 10:27:08 PM EDT
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I have a 2011 3/4 ton GMC Yukon XL, with GM's integrated trailer brake controller. Last week, my DIC flashed a message saying "Service Trailer Brake System". I didn't have a trailer hooked up, so I'm guessing something didn't initialize correctly after I started the truck. I found the ITBC on the passenger frame rail, and it was covered in mud/cow shit/grass/sticks, so I unplugged everything, cleaned it up and plugged it back in. I still the the same message on the DIC, but now I can't even adjust the trailer gain (no numbers even display on it). It seems as though I borked the ITBC module when I cleaned everything up.
Is this a user-replaceable part, or do I have to take my truck to the dealer for reprogramming/module flashing/upgrading or whatever else? Any GM techs in the house? Thanks. |
