Hi Y'al, new here. Having trouble towing. Anyone know how to fix this? I have 2001 2500HD Chevy Duramax. pulling fifth wheel camper 12000lbs. aprox. after couple hundred miles if I have to slow down then start up again it goes into limp mode and won't go over 40 mph. I have to pull over, turn truck off, sit five mins. then start again. Then I have to be careful or it will keep doing it. Any Help or experience with this?