Last weekend I posted in 911 about P1753 I had on my truck. I changed the TTVA and had the code reset thinking that was the solution. About 15 miles into my return trip home with the camper I felt it go into derate again. Limped my way home and checked it with my little code reader. Same code. I have checked the harness and plugs and operation of the TTVA. Does anyone have any other suggestions? I'm going to try and see if my Mac mentor will let me read governor pressure tonight