P0922Gear Shift Forward Actuator Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Set when the drive circuit of the forward shift actuator of an automated manual gearbox shows a voltage that is too low for the current switching state. This usually points to a short to ground on a valve or motor line, or to an internal short in the actuator. Many controllers then switch the output off to protect the driver stage. No manufacturer documents this code publicly. A ZF patent drives each chamber of a double-acting shift cylinder through its own solenoid valve, and an Isuzu patent runs an electric shift motor in both directions, so a fault can affect one shift direction only. CARB requires circuit checks on outputs. P0923 is the opposite high fault, P0920 the open circuit, P0926 the reverse direction. Gears in this direction are blocked.
- What you may notice
- Transmission warning light on
- Certain gears can no longer be engaged
- Gearbox may stay in neutral or hold one gear
- Likely causes
- LikelyDrive wire chafed through and shorted to ground
- PossibleInternal short in solenoid coil or shift motor
- RareWater or corrosion bridging pins in the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.