Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid A valve
- Shift solenoid A valve harness or connectors
- Shift solenoid A valve circuit is open or shorted 
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Tech notes
When the a transmission solenoid is malfunction, in most cases the
problem is not the electrical part of the solenoid; the problem is
foreign material obstructing the mechanical function of the solenoid or
the flow of the fluid through the transmission valve body. If the
transmission fluid is very dirty, it is recommend changing the
transmission fluid and if possible removing the transmission pan for
further diagnosis. Excessive debris or metal particles on the
transmission pan could be an indication that there is a transmission
mechanical failure and that the transmission will need to be rebuilt or
replaced.
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When is the code detected?The P0750 code is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.
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