P09A7Gate Select Position Circuit C 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
- Rationality fault on gate select circuit C: the value is electrically valid, yet it disagrees with the other select channels, the learned gate positions or the commanded movement. A Mannesmann Sachs patent shows why several select signals can exist: when one sensor fails, the remaining ones still allow controlled positioning before an emergency mode based on stored drive times takes over. No manufacturer documents this code or the role of circuit C publicly. CARB requires rationality checks on such inputs. P09A6, P09A8 and P09A9 are electrical faults of C, P0905 and P09A3 the same check on A and B. The driver usually notices slower or restricted shifting.
- What you may notice
- Check engine or transmission warning light on
- Slower or hesitant gear changes
- Some gears no longer offered
- Likely causes
- LikelyDrifting or worn sensor so signal C disagrees with the other channels
- PossibleSelect positions not relearned after repair work on the actuator or gearbox
- PossibleLoose sensor mounting or magnet shifting the measured position
- RareContact resistance in the connector of circuit C
- 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.