Passenger brake light stuck on

KDye · March 27, 2018

So after getting my truck back last Thursday, I now (Monday it started) have this problem... and since my warranty is out they want to charge me after they just had it replacing the transmission control module and reprogramming.

I have a video but it’s too large to load on here. The LED bar that does running lights, turn signal and brake, and backup lights is all working fine... even the right turn signal on it is good. That bar is hooked up to my trailer hitch which at this point must be ran off another relay or circuit since it worked fine until the dealer said to remove it before we went further. The running lights all around work fine, and the left and 3rd brake light work perfectly. The issue is the passenger brake light is illuminating constantly like the computer thinks I’m braking to that light only which kills my battery... it will not go off at all.

After pulling the bulbs out so the truck doesn’t die, I now get an indicator at the dash that there is a light out when I put the turn signal on. So the computer obviously sees the resistance of the bulbs just fine. If there was a short it wouldn’t see the bulbs and throw that indicator with them in, I would think?!

I did car audio and alarms and stuff when I was younger so I know a little about the electric system, but these days everything is tied to a computer so I’m thinking it’s related to that in some way. I do home audio video Service and programming now so I’m racking my brain to find what makes sense to me before I go ripping the truck apart and not finding the issue, or it is the computer that could be a quick fix possibly. Or maybe this is an extension to the 2.7 million recalls they had on brakes from previous years and just not part of it yet.

Hopefully someone has seen this! Any help is appreciated, even a wiring diagram that can lead me in the right direction would be helpful.

2015 Chevy Silverado 1500