Thank you guys,
I’d assume that P0751 translates to Volvo’s TCM-000B “Shift solenoid S1- Hydraulic fault”. The only think puzzles me is that first 2-3min ( ½ a mile or so) car’s shifting fine, until the transmission warms up. Make more sense solenoid to get stuck in OFF position when car is shifting cold. Or at least to remain jammed even when car is cooled down. My point is all mechanical and hydraulic system suppose to work better when car’s warm. Just the opposite of the car’s electronics. Unless there’s an internal leak somewhere on the path from solenoid to the gear clutch….
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