Damaged, chafed or shorted-to-ground wiring in the sensor signal circuit; Faulty clutch pedal position sensor 'B' (internal failure or worn track); Corroded, loose or water-damaged connector at the sensor or control unit; Open circuit or high resistance in the sensor reference voltage or ground supply; Pedal assembly or sensor mounting out of adjustment, or sensor target damaged; Fault inside the control unit that reads the sensor.

P08B6

Clutch Pedal Position Sensor B 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
B6: FaultThe specific fault in that area

What it means

P08B6 means the control unit has detected a voltage in the clutch pedal position sensor 'B' circuit that is lower than the expected range. The sensor signal is typically monitored against a set voltage window, and a reading below that window, such as a short to ground or an open circuit with the signal pulled low, sets the code. Which sensor is labelled 'B' and how it is used varies by vehicle and engine.

Symptoms

Engine warning light on
Engine will not start, or starts only with the clutch pedal pressed repeatedly
Start/stop system not working
Cruise control unavailable or cutting out
Hesitation or uneven response when pulling away or changing gear
Torque limiting or poor throttle response on some models

Possible causes

Damaged, chafed or shorted-to-ground wiring in the sensor signal circuitlikely
Faulty clutch pedal position sensor 'B' (internal failure or worn track)likely
Corroded, loose or water-damaged connector at the sensor or control unitlikely
Open circuit or high resistance in the sensor reference voltage or ground supplypossible
Pedal assembly or sensor mounting out of adjustment, or sensor target damagedpossible
Fault inside the control unit that reads the sensorrare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting any other pedal, brake or supply voltage codes
Inspect the clutch pedal sensor, its connector and nearby wiring for damage, chafing, corrosion, moisture or signs of previous repair
Check the live data for the clutch pedal sensor B signal and see whether the reading changes smoothly as the pedal is pressed and released
Check the sensor mounting and pedal movement for looseness, damage or incorrect adjustment, following the manufacturer's procedure for the model
Back-probe or disconnect the connector and measure the reference voltage, ground and signal against the wiring diagram for that vehicle
Test the signal wire for a short to ground and for continuity and resistance back to the control unit
Wiggle-test the harness and connector while watching live data to find intermittent faults
If wiring and supplies are good, test or substitute the sensor, and only then suspect the control unit

How to fix

Repair or replace the damaged wiring section and secure it away from sharp edges and heat
Clean or replace corroded or damaged connector terminals and the connector housing
Replace the clutch pedal position sensor 'B' and adjust or calibrate it as the manufacturer specifies
Restore the correct power or ground supply to the sensor circuit
Repair or replace the pedal assembly or sensor mounting if it is worn or damaged
Clear the code after repair and road test to confirm it does not return

Can I keep driving?

Medium severity

The car can often be driven short distances, but starting problems, a disabled start/stop or cruise control, or reduced performance may get worse. Have it checked soon, and avoid relying on it if it is failing to start reliably or behaving unpredictably.

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