Blueduck3285
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I was heading west on I-70 out of Denver to Grand Lake and put the truck into tow/haul when heading over the pass to Winter Park (I have a payload of about 2000 not including myself and my wife). As I was hitting those turns going uphill, dropping down to 10-15 mph, the truck stayed in 4th gear and would not downshift. It was a slog getting up the hill. Even when I tried to switching out of tow/haul and manually forcing the truck into a lower gear, it just stayed in 4th until I was down and had parked and shut the truck off. Once I restarted the truck, everything worked normally.
On our way home, I didn't want the same situation so I kept tow/haul off and manually locked out 5/6 and the truck operated as you would expect, downshifting when slowing for the turns to get into an appropriate powerband.
Would this be an issue with the ECU, that it is sticking in 4th when selecting tow/haul? Even out of tow/haul it stayed in 4th even when coming to a complete stop at a light. So long as I don't use tow/haul, it seems to function perfectly fine.
On our way home, I didn't want the same situation so I kept tow/haul off and manually locked out 5/6 and the truck operated as you would expect, downshifting when slowing for the turns to get into an appropriate powerband.
Would this be an issue with the ECU, that it is sticking in 4th when selecting tow/haul? Even out of tow/haul it stayed in 4th even when coming to a complete stop at a light. So long as I don't use tow/haul, it seems to function perfectly fine.