GMequalsPOS

Thank you for that. Although I didn't mention it as it wasn't related to my original question, I did try replacing the dash switches. Didn't resolve the issue, also checked the connectors at the rear of the truck, reseated everything, checked for voltage at the controller by the spare tire, etc. Anyway, the aftermarket controller is installed and working. After googling that GM bulletin (thanks again) and that step 4, what it appears to me, is using the truck's existing wiring between the cab and under the hood (instead of having to run your own wire through the firewall) from the aftermarket brake controller to the 7-way trailer connector. As it also indicates that you need to run your own wire from the 7-way connector to that terminal block under the hood. With that GM bulletin number, I found this (https://www.duramaxforum.com/threads/adding-aftermarket-brake-controller-to-2015.1017203/) post where someone basically did the same thing, following that bulletin (plus some extra) and in one of their pictures, I can see in the DIC, that the truck still knows the ITBC is there. So although that bulletin explains the easiest way (not really) to install an aftermarket controller, bypassing the truck's blue brake wire, it doesn't actually disable/remote the ITBC, it just doesn't use it to supply the voltage on the 7-way trailer connector. Hope that makes sense.

Good day, Every time I start my 2017 Sierra 1500, I get a msg on the DIC, Service Trailer Brake System. Was too costly (repair shops want $180 just to diagnose the issue) to get the integrated one fixed and an aftermarket controller was only $120. Despite the aftermarket controller being installed and working fine, I still receive the msg on the DIC. How can I disable/remove/disconnect/stop that f'n msg on the DIC, about the brake controller. I'm hoping there's a way to remove the OEM controller and/or tell the truck it doesn't have a trailer brake system... I've googled to no avail. Thanks.