Faulty clutch position sensor with an internal fault giving a low signal; Damaged, chafed or corroded wiring causing a short to earth in the sensor signal circuit; Poor connection or water ingress in the sensor connector; Open circuit or high resistance in the sensor supply or signal wire; Sensor out of adjustment or mounting loose or damaged at the pedal or clutch actuator; Fault in the control unit that reads the sensor.

P0807

Clutch Position Sensor A Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
8: AreaTransmission
07: FaultThe specific fault in that area

What it means

P0807 is the generic code for Clutch Position Sensor A Circuit Low. The control unit saw the signal voltage from the clutch position sensor fall below the expected range, which points to a short to earth, an open circuit or a faulty sensor. The control unit uses this signal to know whether the clutch pedal is pressed or released, so it can affect starting, idle and torque control. How the sensor is used and which control unit monitors it depends on the vehicle and transmission.

Symptoms

Engine will not crank, or only cranks with the clutch pedal pressed in a particular way
Engine management warning light on
Stalling or an unstable idle when pulling away or stopping
Cruise control or stop-start system not working
Hesitation, poor throttle response or jerky pull-away
Gear shifts feel wrong on automated manual or dual-clutch transmissions

Possible causes

Faulty clutch position sensor with an internal fault giving a low signallikely
Damaged, chafed or corroded wiring causing a short to earth in the sensor signal circuitlikely
Poor connection or water ingress in the sensor connectorlikely
Open circuit or high resistance in the sensor supply or signal wirepossible
Sensor out of adjustment or mounting loose or damaged at the pedal or clutch actuatorpossible
Fault in the control unit that reads the sensorrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, then check for related clutch, starter or transmission codes
Visually inspect the sensor, its mounting and the connector for damage, corrosion, moisture or loose pins
Inspect the wiring harness along its route for chafing, pinching or heat damage, especially near the pedal box or bellhousing
With a scan tool, watch the clutch position or clutch switch live data while pressing and releasing the pedal and check it changes smoothly and fully
Check the sensor supply voltage, reference and earth at the connector against the manufacturer's specification
Test the signal wire for a short to earth and for continuity back to the control unit with the connector disconnected
Check the sensor's mounting and adjustment against the manufacturer's procedure for that model
Clear the code and road test to confirm it does not return

How to fix

Replace the clutch position sensor if its output is out of specification
Repair or replace damaged wiring and fix any short to earth or open circuit
Clean, repair or replace corroded or loose connector terminals and seal out moisture
Refit, secure or adjust the sensor to the manufacturer's procedure
Replace or reprogram the control unit only after the sensor, wiring and connectors have been proven good and the manufacturer confirms it

Can I keep driving?

Medium severity

The car may be driveable, but it could stall, refuse to restart or lose features such as cruise control or stop-start. Get it checked soon, and avoid relying on it if it is hard to start or stalls in traffic.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.