I have a cacadia 2019 automatic.
The problem is when i hook into a loaded trailer and put in drive it goes into 5th gear so i have to shift manually to first gear othervise i cannot move with the heavy load. I have to manually shift to first gear for first 2-3 full stops. After that it stops and departs in 1 gear.
What could be the issue?
Also truck acceleration is very slow but not sure if it is related to shifting issue
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