P0805 - CLUTCH POSITION SENSOR CIRCUIT

POST UPDATED IN February, 2023

Description of DTC code P0805 Generic

Most high-performance clutches are operated automatically during gear changes. The Powertrain Control Module (PCM) operates the clutch and gearshift. However, the driver activates them manually from the steering wheel when moving from a standstill at the start of the race. During the race, the driver also performs gear changes by pressing a button located on the steering wheel.

The Clutch Position Sensor (CPS) circuit controls the manual transmission clutch. It makes this process by reading the output voltage from the sensor, which indicates when the clutch is engaged. This sensor is an on/off switch that is mounted near the clutch pedal. The voltage is present on the side of the sensor. Therefore, it causes the contacts to close when the clutch transfer voltage is coupled to the starter solenoid. This circuit prevents the engine from starting before the clutch is engaged.

If the PCM notices that the CPS Sensor circuit voltage or resistance is not within the allowable parameters, the diagnostic code P0805 OBDII will be stored.

Symptoms of fault code P0805 Generic

  • Check Engine light ON.
  • The engine will not start.
  • The vehicle starts without pressing the clutch.

Causes of OBD2 P0805 Generic

Reasons to set the P0805 OBD2 fault code:

  • The Clutch Position Sensor may be faulty.
  • Perhaps the CPS Sensor wires or connector are damaged.
  • There could be a bad system fuse.

Possible solutions of the DTC code P0805 Generic

To troubleshoot the DTC P0805 OBDII, try this:

  • For any diagnosis, it is recommended to consult the Technical Service Bulletins.
  • After locating the Clutch Position Sensor, check for damage. Check that the wires are in good condition and that there are no burned or worn spots. Also, check the sensor connector for corrosion. Make the corresponding repairs.
  • Check the clutch voltage, which should be 12V on one side of the clutch, once the clutch is disengaged. Also, check that the starter motor has the power according to the configuration. If there is a power or ground fault, a continuity test of the wiring, connectors, and other components is required. Fix if necessary.
  • Change the Clutch Position Sensor.

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