Faulty or worn clutch position sensor, or one that has drifted out of range; Damaged wiring, poor connection or corrosion in the sensor circuit; Sensor or its mounting out of adjustment, loose or displaced after clutch or pedal work; Worn clutch pedal assembly, linkage or actuator giving a mismatched pedal position; Worn clutch or hydraulic fault causing the biting point to move away from the sensor reading; Control unit fault or outdated software, where a known fault is documented for the model.

P0806

Clutch Position Sensor A Circuit Range/Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

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

What it means

P0806 is the generic code for a range or performance fault in the clutch position sensor 'A' circuit. The control unit compares the signal from the clutch position sensor with what it expects, or with other inputs such as pedal switch state, engine speed and road speed. If the signal is implausible, stuck, erratic or out of the expected range, the code is stored. It is mainly seen on manual and automated manual gearboxes, and the exact sensor type and location vary by model.

Symptoms

Engine will not crank, or cranks only when the clutch pedal is pressed hard or repeatedly
Stop-start system unavailable or behaving erratically
Cruise control disabled or cutting out
Hesitant, jerky or poor gear changes on automated manual gearboxes
Rough or unstable idle or stalling when pulling away
Warning light on, possibly with a gearbox or stop-start message

Possible causes

Faulty or worn clutch position sensor, or one that has drifted out of rangelikely
Damaged wiring, poor connection or corrosion in the sensor circuitlikely
Sensor or its mounting out of adjustment, loose or displaced after clutch or pedal workpossible
Worn clutch pedal assembly, linkage or actuator giving a mismatched pedal positionpossible
Worn clutch or hydraulic fault causing the biting point to move away from the sensor readingpossible
Control unit fault or outdated software, where a known fault is documented for the modelrare

How to diagnose

Read all stored codes and freeze frame data, and note any related clutch, gearbox, start or stop-start codes
Visually inspect the clutch position sensor, its mounting, the pedal assembly and the wiring for damage, chafing, water ingress or loose connectors
Check the connector pins for corrosion, bent terminals or poor tension, and check the battery condition and voltage
With live data, press and release the clutch slowly and watch the sensor reading for smooth, full-range, repeatable travel with no dropouts or spikes
Check the sensor supply, signal and earth against the manufacturer's wiring diagram and specification, as these vary by model
Check the pedal travel, clutch hydraulics or actuator and sensor alignment for correct operation and adjustment
Check for technical service bulletins or software updates relevant to the vehicle, then retest after any repair

How to fix

Repair or replace damaged wiring and clean or replace faulty connectors
Replace the clutch position sensor if it is out of specification or erratic
Refit, adjust or relearn the sensor position according to the manufacturer's procedure
Repair or replace the worn pedal assembly, linkage, hydraulic components or clutch actuator
Replace the worn clutch if it is found to be the cause of the mismatch
Update the control unit software only if an outdated calibration is a known cause for that model

Can I keep driving?

Medium severity

The car may be drivable, but it can fail to start, stall or lose cruise control and stop-start, so get it checked soon. If gear changes are rough or the engine will not start reliably, avoid driving it until it is repaired.

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