Summit 700
TYF Newbie
- Joined
- Apr 6, 2012
- Posts
- 11
- Reaction score
- 0
Well I got the Yukon running, I pulled all the fuses and relays and used electrical contact cleaner on them and the ecm and bcm connections. Not entirely sure what the problem was but it is running great now. The only problem I have is that no I'm getting a light on the dash, (!) and a message on the message center that says service trailer break system. Never saw that before. I tried to read the codes and get 2 codes, u0121 & u0137. When I try to enter the trailer break module section on the reader it says vehicle has lost communication.
