2015 GMC Sierra 3500 - Check Trailer Wiring
We just purchased a 2015 GMC Sierra DRW with the Duramax and integrated brake controller. I hooked up the trailer (a 2013 Lifestyle 36FW with the standard electric brakes) for the first time and I dro...
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The installer looked at the truck and trailer and found a loose wire on the trailer plug (where the plug wires connect to the trailer wires). He also felt that there was a kink in the trailer plug so he replaced the trailer plug. I took it for a test drive and still had the Check Trailer Wiring message. Next step is to look at the trailer brakes and the wires going to the brakes. It may be a few days before this happens.
