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Comments
Did you ever find the cause I am having the same problem with my 2013 3/4 Suburban.
I then called for a jumpstart and it started right up but then I had two new messages on "Service battery charging system" and "service trailer brake controller." The other two messages had now been replaced with these two.
I plugged my travel trailer in and the truck would not see trailer. It normally tells me that the trailer is connected and I can see the brake gain when I press the brake pedal, but this time none of that was happening.
I had it towed to the dealer 150 miles away but the dealer says they can't find an issue and can't replicate it. I am about 1500 miles from home traveling with a trailer with the family and now I do not feel safe with this SUV afraid of being stranded or worse without brakes while towing over a mountain pass.
Anyone have any ideas? It looks like other people have ran into this for years now and GM has not fixed it.
Thanks!
G