P0923
Gear Shift Forward Actuator Circuit High
Automated shift actuator
Generic OBD-II
Medium
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.
Medium
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?+
Cautiously. A forward-shift actuator fault can cause harsh shifts, slipping, or limp mode on automated-manual transmissions, so plan a repair rather than a long trip.
Can I just clear P0923?+
It clears, but a high-circuit or actuator fault returns until the wiring or actuator is repaired.
Related codes
Read & clear P0923 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX