P0905Gate Select Position Circuit A Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Plausibility fault of the gate select position signal on circuit A in an automated manual gearbox. The signal is electrically within limits, but it does not fit what the control module expects: typical checks compare the measured select travel with the learned gate positions and the commanded target gate. No manufacturer documents this code in freely citable material. Patents by Aisin AI on select control with target and actual gate, and on fallback strategies after a stroke sensor failure, show how the module depends on this signal; CARB requires rationality checks on such inputs. P0904, P0906 and P0907 cover the electrical faults, P0909 a select movement that misses its target. The driver typically sees a fallback mode with no or limited shifting.
- What you may notice
- Check engine or transmission warning light on
- Gearbox drops to neutral or refuses certain gears
- Slow or jerky gear changes in fallback mode
- Likely causes
- LikelyWorn or drifting gate select sensor, main and redundant tracks disagree
- PossibleHigh resistance at connector pins distorting the sensor voltage
- PossibleGate positions not relearned after actuator, clutch or TCM replacement
- RareLoose or displaced magnet or sensor mounting on the select shaft
- 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: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.