The P0808 code in your 2020 Subaru WRX indicates the clutch position sensor circuit is providing a higher voltage signal than expected. This fault points to conditions causing elevated electrical signal readings from the sensor.
Understanding High Input Faults
A high input reading means the sensor voltage exceeds the maximum threshold the ECU expects at a given pedal position. This can occur when the sensor reads as fully released even when partially or fully depressed.
Common Causes of P0808
- Open circuit in sensor ground wire
- Short to voltage in signal wire
- Sensor internal failure causing high output
- Disconnected or damaged wiring
- Sensor reference voltage issue
- Pedal position sensor misadjustment
Symptoms of High Input
- Vehicle won't start (thinks clutch is released)
- Clutch pedal reads always released
- Check engine light on
- Rev hang issues
- Hill holder problems
- Starter interlock activation issues
WRX Performance Features
The WRX's manual transmission works with various ECU functions that rely on clutch position. High input faults prevent the ECU from knowing when the clutch is pressed, affecting multiple systems.