Customer said it had a 1-2 solenoid code. He replaced both solenoids. Same problem existed.
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Problem
Came in shop with code P0752. We replaced both solenoids and checked wiring. Code is gone but still shifts 1-4. Scanner shows 1-2, 2-3, 3-4. Vehicle gets 4th when it shows 2-3 shift.
Update
David, It will backshift to first when you move the selector to D3 or D2.