Gear Shift Forward Actuator Circuit High
What it means
P0923 means the gear shift forward actuator circuit is reading a high voltage — usually a wiring short-to-power, an open, or a failing actuator. On automated-manual transmissions this actuator moves the shift mechanism to engage forward gears, so the fault shows up as harsh, delayed, or missing shifts and sometimes limp mode. The engine still starts and runs, but shifting needs attention.
Can I keep driving? The engine runs, but the automated shifter may not engage forward gears properly — expect harsh or missing shifts and possible limp mode, so repair before relying on the car.
Common symptoms
What you'll notice
- Check-engine light on
- Improper shifting or inability to shift
- Harsh or delayed gear changes
- Transmission may slip or enter limp mode
Common causes
Most likely first
- Faulty gear shift forward actuatorLikely
- Wiring shorted to voltage or open in the actuator circuitCommon
- Loose or corroded connectorsCommon
- Failed transmission control module (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the actuator connector and wiring for shorts to power or opens.
- Measure the actuator control circuit voltage and resistance against specification.
- Test the actuator for correct operation.
- Replace the gear shift forward actuator if it fails; repair the wiring as needed.
- If the circuit and actuator are good, diagnose the TCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0923?+
Can I just clear P0923?+
Related codes
Often seen with P0923
Read & clear P0923 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.