"Service trailer brake system" on 2016 GMC
Have a 2016 GMC 3500, 6.0 gas job with 57K miles. Constantly now my computer screen beeps "Service Trailer Brake System", even when no trailer is hooked to truck.. took to my local trailer guy, he ...
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Are you not under warranty? If you are I'd take it to the dealer and let them sort out the issue.
