Purchased a used 2020 1500 3.0 diesel about 6 months ago. It has 32000 miles, hasn’t been used to tow or plow. Absolutely love this truck. I haven’t had any issues until a month ago, driving down the highway, cruise set at 60 - I lost all throttle control as if it had went into neutral, the gear indicator ( D ) started flashing. I started to pull off the road and the truck jumped back into 3rd gear and stayed there. It wouldn’t shift up or down. I was close enough to home I drove it there and parked it. Shut the truck off, turned it back on and noticed when putting it into gear it jumped really hard and made a frightening sound. I noticed you could not shift it manually so assumed it was still stuck in gear. Had it towed to a dealer, they claim there was nothing wrong with it. The check engine light said speed sensor faulted but nothing to be concerned with. I asked them to put 50 miles on it and luckily it acted up again. Fast forward a month and these repairs - TCM, both speed sensors, throttle body, temp sensor, transmission service, and they cannot figure it out. The dealership even called GM warranty and told them it’s an intermittent problem that we can definitely live with and advised we pick it up. Which absolutely did not fly, but I’m at a loss and they (GM and the dealer) have no answer on where to go next. I’m a little disappointed to say the least. I was expecting a GM diesel product to last many years under good care without any issues.
The issue has become more persistent, but does reset it self on occasion. It always comes back when the truck gets up to temp.
Does anyone have any thoughts?
The issue has become more persistent, but does reset it self on occasion. It always comes back when the truck gets up to temp.
Does anyone have any thoughts?
