I have 3 trailers. 2 of them give me issues when I hook up in that I do not get the "trailer connected" message. Also when I manually slide the OEM brake controller I do not get the dashes signifying braking. I have hooked up a 2001 duramax with aftermarket controller and it does activate the brakes. the same with a 2015 ford f150 (not sure if controller is OEM or not). on one of my trailers i i discovered both brakes on drivers side had a cut wire. fixed this and all good. my question is would an aftermarket controller still provide breaking action in this case. I was told that the ITBC's on the chevys are very sensitive and need everything to be perfect in order to work.