P0926Gear Shift Reverse 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 reverse shift actuator of an automated manual gearbox, the one moving the shift mechanism opposite to the forward direction, shows a voltage that is too low for the current switching state. This usually means a valve or motor line shorted to ground or an internal short in the actuator; the module often switches the output off to protect itself. No manufacturer documents this code publicly. A ZF patent drives each chamber of a double-acting shift cylinder through its own solenoid valve, an Isuzu patent runs the shift motor in both directions. CARB requires circuit checks on outputs. P0927 is the opposite high fault, P0924 the open circuit, P0922 the forward 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.