Service Trailer Break System message on dash display
Thread Starter
CF Beginner
Joined: Nov 2025
Posts: 1
Likes: 0
Service Trailer Break System message on dash display
I need help. I'm getting service trailer break system on my 2012 GMC Sierra 2500 HD. I have replaced the computer and relay above the spare tire. I have checked all my fuses for the trailer. I have changed the gain trailer switch on the dash. I am at wits end on this. Your help will be much appreciated.
Thread
Thread Starter
Forum
Replies
Last Post
