Clutch Position Sensor Circuit Range/Performance
The engine control module (ECM) or transmission control module (TCM) has detected that the signal from the clutch position sensor is erratic, illogical, or outside the expected operating range. This indicates the module cannot accurately determine the physical position of the clutch pedal or actuator.
While not immediately dangerous, this code should be addressed soon. It can prevent the vehicle from starting due to the safety interlock, or cause cruise control and shifting issues.
Common symptoms
- Illuminated Check Engine Light
- Engine will not crank or start
- Cruise control system is inoperative
- Harsh or erratic shifting (in automated manual transmissions)
- Engine stalling when coming to a stop
Likely causes
- Faulty clutch position sensor
- Misadjusted clutch position sensor or switch
- Damaged, corroded, or loose wiring and connectors in the sensor circuit
- Mechanical wear or damage to the clutch pedal assembly
- Failed Powertrain Control Module (PCM) or Transmission Control Module (TCM)
What to check before replacing parts
Inspect the wiring and connectors at the clutch position sensor
Look for: Look for chafed wires, corrosion, or loose connections that could cause an intermittent or out-of-range signal.
Verify the sensor mounting and mechanical adjustment
Look for: Ensure the sensor is securely mounted and properly aligned with the clutch pedal linkage, and that the pedal physically contacts the sensor correctly.
Monitor clutch position sensor live data using a scan tool
Look for: Observe the sensor voltage or percentage while slowly pressing and releasing the pedal; the reading should change smoothly without dropping out or spiking.
Test the sensor's electrical output with a digital multimeter
Look for: Check the sensor's internal resistance or output voltage against the manufacturer's specifications to confirm it is functioning correctly across its entire range of motion.
Inspect the clutch pedal mechanical assembly
Look for: Check for excessive play, broken return springs, or bent brackets that could prevent the pedal from fully engaging or releasing the sensor.
This page explains the generic P0806 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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