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My GMC 2500HD error message: "service trailer brake system" 135000
2008 GMC 3500 Factory Brake Controller Does Not Work on Trailer with
2012 Gmc Sierra Trailer Wiring Diagram
2011 GMC Sierra Tekonsha Prodigy P2 Trailer Brake Controller - 1 to 4
Silverado Sierra "Service trailer brake system" Easy and cheap Fix