Faulty clutch pedal position sensor (internal failure or worn track); Damaged, chafed or corroded wiring in the sensor circuit, such as a short to voltage or open circuit in the signal or ground wire; Poor connection at the sensor connector or loose, corroded or pushed-out terminals; Sensor out of adjustment or pedal bracket damaged or worn, giving an out-of-range reading; Open circuit in the sensor ground or reference supply fault; Fault inside the powertrain control module or other controller sharing the signal.

P08AA

Clutch Pedal Position Sensor A Circuit High.

Generic
Powertrain
Generic code
Low severity

How this code is built

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

What it means

P08AA means the powertrain control module has detected a voltage that is too high on the clutch pedal position sensor 'A' circuit. The signal has gone above the expected range, which usually points to a short to voltage, an open circuit or a fault in the sensor itself. The module can no longer trust the clutch pedal position it is being given.

Symptoms

Engine management warning light on
Engine will not crank, or cranks only with difficulty, on cars that need the clutch pressed to start
Start-stop system not working or disabled
Cruise control not working or cancelling unexpectedly
Hesitation, surging or poor throttle response when changing gear
Hill-start assist or torque management behaving oddly

Possible causes

Faulty clutch pedal position sensor (internal failure or worn track)likely
Damaged, chafed or corroded wiring in the sensor circuit, such as a short to voltage or open circuit in the signal or ground wirelikely
Poor connection at the sensor connector or loose, corroded or pushed-out terminalslikely
Sensor out of adjustment or pedal bracket damaged or worn, giving an out-of-range readingpossible
Open circuit in the sensor ground or reference supply faultpossible
Fault inside the powertrain control module or other controller sharing the signalrare

How to diagnose

Read all stored codes and freeze frame data, noting whether other pedal or sensor supply codes are present, then check for any related service information for the model.
Inspect the clutch pedal sensor, its connector and the surrounding wiring for damage, chafing, water ingress and corrosion.
Check the sensor mounting and pedal bracket for looseness, wear or damage, and that the sensor is correctly positioned for the model.
With a scan tool, watch the live clutch pedal position or switch data while pressing and releasing the pedal and look for a smooth, plausible change, or a reading stuck high.
With the connector unplugged and ignition on, measure the reference supply and ground at the harness against the manufacturer's specification.
Check the signal wire for a short to voltage and for continuity back to the control module, and test the ground for resistance.
Test the sensor itself against the manufacturer's specification, as the expected values and sensor type vary by model.
If wiring and sensor test good, check the module's power and ground supplies before suspecting the module.

How to fix

Replace the clutch pedal position sensor and adjust or set it up as the manufacturer specifies.
Repair or replace damaged wiring, and clean or renew corroded terminals in the circuit.
Secure or replace the connector if the terminals are loose or damaged.
Repair or replace a worn pedal bracket or mounting, then check the sensor position.
Replace or reprogram the control module only if a fault in it is confirmed and the manufacturer calls for it.

Can I keep driving?

Low severity

The car can usually be driven, but expect features such as cruise control or start-stop to be unavailable. If it becomes hard to start or the engine hesitates, have it checked sooner.

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