ChrisWithTheCanyon

valid point - and considered that. I don’t have any 12v loads while traveling with the current trailer. Fridge is propane or shore power. I do agree that your suggestion is a better solution. May indeed do that.

Super thankful to land on this forum. This was my EXACT issue with my new 2023 GMC Canyon towing my RV that I've had for 4 years (bought brand new). I know 100% that it is not a wiring issue as I just dropped a new axle in (personal preference for an upgrade), have new brakes and ran all new wiring and tested all wires out myself, validated brakes worked and went for my first test trip and got the message over and over and over. Long story short and after doing all the simple things first... I ran across this thread. I already had a disconnect for my solar in place, simply disconnected and magically everything worked flawlessly with no more errors. Ended up going 200 miles with no messages at all. After getting home, I ended up putting a disconnect in for the power lead coming from the truck to the trailer as I really don't want it trickle charging my battery system anyway and there is nothing for it to power either. My emergency break away brake is connected to the RV batteries and no need for powering from the tow vehicle. Did another drive today with the solar ON and the power lead disconnect in the OFF position. Worked flawlessly. Super frustrated that the built in controller has this problem but again - thankful for this forum to help diagnose and get it fixed up so that it is not a safety issue while on the road. I'm going to turn this into my local shop too and see what happens.