The situation that occurred is as below.
I am on a steep gravel forest road that has several very steep passes around 30% grade. My truck ran with no issue with moderate passes. However, when I am climbing a steep hill in 4-wheel drive at approximately 10-15 MPH, I lose all power and the truck chugs (almost like a train would), the check engine light will go on. When I step on the accelerator nothing happens. When I stop and place the engine in neutral it will rev up with no issue. When return to Drive the same issue will occur. I even tried downshifting into gear 1 and still no better. Once I was able to turn the truck around and go back downhill, the engine light goes off and it runs perfectly well.
I have been on this road and pass many times in the past with a much heavier trailer approximately 5,000 lbs and had no issues. The transmission was serviced (regular maintenance) fluid changed etc. No issues were reported by the dealership.
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Wednesday, July 5th, 2023 AT 5:12 PM