Recently purchased a 2018 3500 HD and on the way home a service trailer brakes message came on along with ABS light. There was no trailer being towed. It eventually went away as the drive continued. After arriving home I plugged in my horse trailer to check everything and the left trailer blinker would not work and then I received messages of service trailer brakes and check trailer connection.
No issues with this trailer and my 2012 3500.
I checked fuses and saw that the 12-volt auxiliary was missing a fuse and corrected that. I ohmed out all of the other fuses associated with a trailer. I disconnected the connection at the rear of the truck that supplies signal to the bumper and in bed outlets. I got a very weak voltage reading on the left blinker so the issue stems from that point forward. With random messages and funny acting lights, I have read in numerous forums that it's the BCM. Can anyone please advise?
