P0925Gear Shift Reverse Actuator Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Plausibility fault in the drive circuit of the reverse shift actuator of an automated manual gearbox, the actuator that moves the shift mechanism opposite to the forward direction. The circuit is neither open nor shorted, but current, voltage or the resulting shift movement do not match the command. No manufacturer documents this code publicly. A Hyundai/Kia patent detects jammed shift actuators from rising motor current, and a ZF patent shows double-acting shift cylinders with one solenoid valve per chamber, so each direction can be judged on its own. CARB requires functional checks on such outputs. P0924, P0926 and P0927 are the clear electrical faults, P0921 the forward direction, P0919 the missed target. Shifts in this direction become slow or fail.
- What you may notice
- Transmission warning light on
- Slow, harsh or aborted gear changes in one direction
- Fallback mode with fewer available gears
- Likely causes
- LikelySticking shift valve, worn shift motor or stiff shift linkage
- PossibleSolenoid or motor resistance out of specification
- PossibleIncreased contact resistance in connector or wiring
- RareInsufficient hydraulic pressure on hydraulic units
- 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: €150 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.