Code p0750 for a2001 ford expedition Eddie Bauer

Found this online:

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid 1 valve
- Shift solenoid 1 valve harness or connectors
- Shift solenoid 1 valve circuit is open or shorted

Failed "shift solenoids" in older tansmissions is not an uncommon problem. Shift solenoids can often be accessed after removing the transmsission oil pan, so the transmnission may not have to be removed from the vehicle.

If the transmission fillter and fluid have not been replaced on schedule, consider having that done first to see if the problem goes away.