I have called the dealer, but, with them more than 100 miles away, and with me needing to leave Wednesday, I do not think the dealer is going to be much help. They do provide one year of mobile service, so maybe there.
I checked my truck tonight, and do not think that is the issue. I used the plug tester on my truck and my wife's (which is also a 2012 Ram CTD) and they both are the same, and she's never had an issue with her horse trailer. So tomorrow I'll start looking on the trailer. I did find the code the controller was displaying, and it is for a short circuit. Checking the box at the pin should be too bad. For the brakes themselves, I guess I'll have to jack it up and remove the rim and hub?
Thanks for the input!
2012 Ram 2500 Laramie Limited CCLB CTD
2014 Columbus 320RS