I would first check to make sure your truck harness and camper harnesses match brake power wiring. Years ago, I worked for a guy that has to change the plug wiring on every new truck he bought. Didn't realize, or wouldn't admit, his trailers were just wired incorrectly at the harness.
But, aside from that, follow wiring from harness or near each tire and do a visual inspection if the wiring.
Coarse, it's newer and if you have the two year warranty, I'd call my dealer if it's not a simple fix.
Joel and Teresa
2016 Sabre 34TBOK
2006 GMC 3500 CC LB DRW 4X4