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jabres's avatar
jabres
Explorer III
Jan 15, 2019

"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 ...
Tow Vehicles
ksss's avatar
ksss
Explorer
Jan 15, 2019
My 08 was doing that this Winter first time I had seen it before. Moisture or issue at the rear plug is cause.

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