"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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Friends truck had same issue, was the ground on the module up by spare tire. It’s not expensive to just replace it.
