P0908Gate Select Position Circuit A Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Points to a gate select position signal on circuit A that drops out or jumps for short moments in an automated manual gearbox, too briefly or too irregularly for a steady low or high fault. Loose terminals, a damaged harness that moves with the engine, or moisture in the connector at the shift and select actuator are the usual reasons. No manufacturer documents this code publicly. An Aisin AI patent explains why even short sensor dropouts matter: if a stroke sensor fails while driving, the controller can no longer confirm the engaged gear and must switch to a fallback strategy. CARB requires circuit and rationality checks on such inputs. P0904 to P0907 are the steady faults of the same circuit. Drivers often notice occasional neutral drops or refused shifts that vanish again.
- What you may notice
- Warning light that comes and goes
- Occasional drop to neutral or refused shift
- Fault often disappears after restarting the engine
- Likely causes
- LikelyLoose or spread terminals at the sensor or actuator connector
- PossibleHarness damage that only opens or shorts under engine movement
- PossibleMoisture or corrosion in the connector near the gearbox
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.