P0805
Clutch Position Sensor Circuit
- Severity
- Medium
- Driving
- Drivable — book it in
A fault in the clutch position sensor circuit. On an automated manual or dual-clutch transmission the module needs to know exactly where the clutch is in order to engage it smoothly. Without that it cannot control take-up, so expect jerky moving off, harsh engagement or a refusal to drive at all.
Possible causes
- CommonFailed clutch position sensor
- CommonCorroded or damaged connector at the sensor
- CommonWiring damage between the sensor and the module
- CommonSensor out of calibration after clutch or actuator work
- PossibleWorn clutch beyond the sensor's adjustment range
- PossibleLoss of reference voltage or earth
What you might notice
- Jerky or harsh take-up when moving off
- Transmission will not engage a gear
- Judder at low speed
- Warning message about the transmission
- Check engine light on
What to check, in order
- Ask whether the clutch or its actuator has been replaced recently. These systems need calibrating afterwards, and an uncalibrated sensor is far more common than a failed one.
- Watch the clutch position reading on the live data screen through an engagement cycle.
- Check the reference voltage and earth at the sensor before condemning it.
- Inspect the connector for corrosion and the harness for chafing.
- Consider clutch wear. A clutch worn past the range the sensor can report produces this code with everything working as designed.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Transmission
P0800P0801P0802P0803P0804P0805P0806P0807P0808P0809P0810P0811P0812P0813P0814P0815P0816P0817P0818P0819P0820P0821P0822P0823P0824P0825P0826P0827P0828P0829P0830P0831P0832P0833P0834P0835P0836P0837P0838P0839P0840P0841P0842P0843P0844P0845P0846P0847P0848P0849P0850P0851P0852P0853P0854P0855P0856P0857P0858P0859P0860P0861P0862P0863P0864P0865P0866P0867P0868P0869P0870P0871P0872P0873P0874P0875P0876P0877P0878P0879P0880P0881P0882P0883P0884P0885P0886P0887P0888P0889P0890P0891P0892P0893P0894P0895P0896P0897P0898P0899