P0750: Shift Solenoid A
What to do
Note exactly which gears you still have and which you do not — that pattern identifies the failed solenoid faster than anything a scan tool will show. This is usually a repair from underneath rather than a transmission removal, so treat quotes for major work with caution until that has been established.
What this code means
A fault in the first of the transmission's shift solenoids. These are the valves that route hydraulic pressure to apply and release the clutches, and so actually select the gear.
The structural point that makes shift solenoid codes readable is that there are fewer solenoids than gears. The module operates them in combinations — solenoid A on and B off gives one gear, both on gives another — so one failed solenoid does not remove one gear. It removes a specific set of them, and the set that remains identifies which solenoid failed without any measurement at all. A transmission that has first and second but nothing above, or one that has second and fourth but not first and third, is describing its own fault precisely.
The reassuring part: on most transmissions the shift solenoids live in the valve body, reachable by dropping the pan from underneath. That is a moderate job, and emphatically not a rebuild.
Likely causes
Start here
- Failed shift solenoid · moderate
- Debris in the transmission fluid · moderate
- Damaged transmission wiring harness · moderate
Less common
- Low or degraded transmission fluid · easy
- Worn valve body · specialist
Rare
- Faulty transmission control module · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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