P0907Gate Select Position Circuit A High
- 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 gate select position signal on circuit A of an automated manual gearbox stays above its highest valid value for longer than a calibrated time. Typical causes are a short of the signal line to the sensor supply or to battery voltage, a broken sensor ground, or an internal sensor fault. No manufacturer documents this code publicly. The patents of Aisin AI and Isuzu on select control show that the module derives the active gate directly from this sensor voltage, so a reading above the valid band leaves it blind in the select direction; CARB requires out-of-range checks on such inputs. P0906 is the opposite low fault, P09A5 and P09A9 are the high faults of circuits B and C. For the driver this usually means a warning lamp and a gearbox that no longer changes gear or stays in a fallback gear.
- What you may notice
- Check engine or transmission warning light on
- Gearbox stays in one gear or in neutral
- Engine may not start because neutral cannot be confirmed
- Likely causes
- LikelySignal wire shorted to sensor supply or battery voltage
- PossibleOpen sensor ground or corroded ground pin
- PossibleInternal fault of the gate select sensor
- RareFaulty input stage in the transmission control module
- 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.