ralanis6

I too have a 2500HD and tow a 5th wheel and would get this warning from time to time. I check the 7 pin connector and move the pins so that the connection will be tighter. This usually takes care of it, but it has come back again maybe due to the movement or the connecting and reconnecting of the plug.

I have a 2016 Chevy 2500HD and had this issue at 43,000 miles. Dealer replaced it and I am glad it was covered by warranty. Have not driven it much since then.