There were no codes on mine either. No loss of any fluids Had to wait 5 months for the new engine. They don't have any on hand because they are going through so many. They are made in Italy.
I have not heard of an issue with the torque converter. But the engines are blowing regularly. Some of them are the timing chain, not sure what mine is. They would not do a tear-down.
I was towing 3500 lb trailer. Started hearing knocking, started to pull over, then coasted to the side of the road. Could not turn it over. Five months later dealership replaced engine and torque converter. $15055 later. Sure seems that this is an issue that Ram should deal with.