Normally would not be an emergency but I am supposed to leave in the morning with the fiver for a new job. Long story short I jerked the 7 wire loose from the junction box on the hitch. I have reconnected it the best I can think of and everything works just no brakes. All lights work and the truck is saying to service trailer brakes. I plugged into my flatbed and got the same error. I unhooked the battery and then reconnected and I had brakes on the flatbed. Pulled back over to the fiver and boom same error.
Reading on the issue, the only DIY solutions are to check all the lights, and pull the 7-pin connector out from the back of the housing and apply dielectric grease to the factory harness/7-pin adapter. If it continues, looks like it is a dealer repair.
Check that you connected the wires in the j-box correctly. Here's some pics that may help.
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Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired
I had this issue with my truck (2015 2500HD) and it was intermittent. Took it to dealer and they changed the trailer brake controller under warranty. No problems since.
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