P08A9

What it means

P08A9 means the control unit has detected a low voltage or signal in the clutch pedal position sensor 'A' circuit. The signal has dropped below the expected range, which points to a short to earth, an open circuit or a faulty sensor. The control unit can no longer trust the clutch pedal position, which it uses for functions such as starting permission, idle control and stop-start. The exact sensor type and how it is used varies by model.

Symptoms

• Engine cranks slowly or will not start because the control unit does not see the clutch as pressed
• Stop-start system disabled or not working
• Unstable or hunting idle when the clutch is pressed or released
• Hesitation or jerky response when pulling away or changing gear
• Cruise control not working
• Engine warning light on

Possible causes

• Faulty clutch pedal position sensor or its internal circuitlikely
• Damaged, chafed or shorted wiring to earth in the sensor circuitlikely
• Corroded, loose or contaminated connector at the sensorlikely
• Open circuit or high resistance in the sensor supply or signal wirepossible
• Sensor loose, misaligned or out of adjustment on the pedal bracketpossible
• Internal fault in the engine or body control unitrare

How to diagnose

1. Read all stored and pending codes and note the freeze frame data, then check for other codes related to the pedal, starter or supply voltage
2. Visually inspect the sensor, pedal bracket and wiring near the pedal for damage, water ingress, chafing or signs of previous repairs
3. Disconnect the sensor connector and check the pins for corrosion, bent terminals and a good fit
4. With a scan tool, watch the live clutch pedal position or switch data while pressing and releasing the pedal and check for a smooth, plausible change
5. Check the sensor reference supply and earth at the connector against the manufacturer's specification for your model
6. Test the signal wire for a short to earth and for continuity back to the control unit with the battery disconnected, following the wiring diagram
7. Check that the sensor is mounted and adjusted correctly, as the setting procedure depends on the model
8. If the wiring and sensor test fine, check the control unit supply and earths before suspecting the control unit

How to fix

• Replace the clutch pedal position sensor and adjust or calibrate it as the manufacturer requires
• Repair or replace damaged wiring and secure it clear of moving parts
• Clean or replace the corroded or damaged connector terminals
• Refit and correctly adjust the sensor on the pedal bracket
• Repair the supply or earth fault, and only if the control unit is proven faulty replace or repair it and carry out any required programming

Can I keep driving?

Nearby codes

• P08A8GenericClutch Pedal Position Sensor A Circuit Range/Performance
• P08AAGenericClutch Pedal Position Sensor A Circuit High