P0750
Shift Solenoid A
When a vehicle powertrain module registers the fault code P0750, it points directly to an internal system malfunction identified as "Shift Solenoid A". Operating your engine under this condition may degrade long-term fuel maps.
Driver's Summary
A P0750 fault code points directly to a problem with shift solenoid a that the ECM has confirmed over multiple drive cycles. You may notice transmission will not shift out of a specific gear, check engine light, all of which are direct consequences of this malfunction. Stop driving as soon as it is safe to do so. This fault can lead to expensive secondary damage if left unaddressed.
Symptoms
Transmission will not shift out of a specific gear, check engine light
Common Causes
- Defective shift solenoid A
- Dirty or burnt transmission fluid
- Clogged transmission filter
- TCM failure
How to Fix
- 1 Replace Shift Solenoid A
- 2 Change transmission fluid and filter
- 3 Test solenoid wiring circuit
- 4 Reprogram or replace TCM
Technical Explanation
To set P0750, the PCM samples the affected circuit multiple times per second, comparing live readings against manufacturer-programmed operating windows. Shift solenoid circuits are monitored for both functional performance (does the transmission achieve the commanded gear ratio?) and electrical integrity (is the solenoid's resistance within the normal range of 10–40 ohms?). Once confirmed, the code is stored as a permanent DTC and the MIL is activated. The freeze frame snapshot — recording RPM, load, coolant temperature, and fuel trim at fault detection — is also saved and is critical for accurate diagnosis.
Is It Safe to Drive?
This fault carries real mechanical risk. The root causes — including defective shift solenoid a — can trigger a chain reaction of component failures if the vehicle continues to be driven. Have it towed or drive directly to a shop without delay.
Mechanic's Pro Tip
For P0750, test the solenoid's coil resistance with a multimeter before ordering parts — most solenoids should read between 14 and 40 ohms; an open (infinite resistance) or short (near zero) confirms it's failed electrically. Also verify the PCM is commanding the solenoid by backprobing the connector with a test light during the relevant operating condition — if there's no command signal, the fault is in the PCM or wiring, not the solenoid itself.
Solenoid replacement and fluid: $250 - $600