P0750
Shift Solenoid A.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- 50
- FaultThe specific fault in that area
What it means
P0750 is the generic code for a fault in the Shift Solenoid A circuit or its operation. The transmission control module commands the solenoid and checks the circuit, and sets the code when it sees an open circuit, short circuit or a mismatch between the commanded gear and the actual result. The exact gears affected and the type of fault that sets the code depend on the vehicle and transmission.
Symptoms
- Transmission stuck in one gear (limp mode)
- Harsh, delayed or flared gear changes
- Gearbox not shifting up or down when expected
- Gearbox warning light or malfunction message on the dashboard
- Poor fuel economy or reduced performance
- Engine management light on
Possible causes
- Faulty shift solenoid A (stuck, worn or electrically failed)likely
- Damaged wiring or poor connector contact between the solenoid and the transmission control modulelikely
- Low, degraded or contaminated transmission fluidlikely
- Blocked transmission filter or restricted valve body passagespossible
- Internal wiring loom fault inside the transmissionpossible
- Worn valve body or internal hydraulic faultpossible
- Faulty transmission control module or software issuerare
How to diagnose
- Read the stored codes and freeze frame data to see gear, speed, load and temperature when the fault set, and note any other transmission or communication codes
- Check the transmission fluid level, condition and smell, following the manufacturer procedure for that gearbox (some are sealed or need a set temperature)
- Inspect the wiring and connectors to the transmission for chafing, fluid ingress, corrosion and loose pins
- Check battery condition and charging voltage, as low voltage can cause false transmission faults
- Measure solenoid A resistance and check the supply and control circuits against the manufacturer specification for that model
- Use live data or an actuator test, where supported, to see if the solenoid responds to commands and if the gear ratio matches the commanded gear
- Check for relevant technical service bulletins or software updates for the transmission and vehicle
- Inspect the transmission pan, filter and debris for metal or clutch material if internal wear is suspected
How to fix
- Repair or replace damaged wiring, terminals or connectors found in the solenoid circuit
- Replace the faulty shift solenoid A, or the solenoid pack where it is not sold separately
- Correct the fluid level or change the fluid and filter using the specified type
- Clean or overhaul the valve body, or replace it if worn or blocked
- Repair or replace the internal transmission harness if faulty
- Update or replace the transmission control module software or unit only if testing proves it faulty or an outdated calibration is a known cause
Can I keep driving?
Medium severity
The car can usually be driven carefully for a short time, but it may be in limp mode with limited gears. Have it checked soon, as continued driving with a shifting fault can cause further transmission damage.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.