Worn or misadjusted clutch pedal position sensor linkage or pivot.; Contaminated or failing clutch pedal position sensor (dirt, oil, or internal wear).; Damaged or chafed wiring between the sensor and the ECM, often near the pedal box.; Loose, corroded, or backed-out electrical connector at the sensor or ECM.; A faulty clutch pedal position sensor that has drifted out of calibration.; Aftermarket floor mats or pedal covers that restrict full pedal travel.; Rarely, an internal ECM fault or software issue affecting the sensor signal processing.

DTC codes / P08xx · Transmission / P08A8

P08A8Clutch Pedal Position Sensor A Circuit Range/Performance

Q: What does code P08A8 mean?

Clutch Pedal Position Sensor A Circuit Range/Performance. P08A8 means the engine control module (ECM) has detected that the clutch pedal position sensor A circuit is not behaving as expected over its full range of travel, such as an implausible signal or a performance fault during a self-test. The ECM compares the sensor voltage against known good values for the pedal's resting and fully pressed positions and flags the code when the signal falls outside the expected range or fails to change smoothly.

P08A8 means the engine control module (ECM) has detected that the clutch pedal position sensor A circuit is not behaving as expected over its full range of travel, such as an implausible signal or a performance fault during a self-test. The ECM compares the sensor voltage against known good values for the pedal's resting and fully pressed positions and flags the code when the signal falls outside the expected range or fails to change smoothly.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Symptoms you may notice

The check engine light or a dedicated clutch system warning light is illuminated.
The engine may hesitate, stumble, or stall when you press or release the clutch pedal.
Cruise control may fail to engage or disengage unexpectedly.
The engine may not start unless the clutch pedal is pressed very hard or pumped several times.
A message such as 'Press clutch to start' may appear even when the pedal is fully depressed.
Often no symptoms besides the warning light, especially if the fault is intermittent.

Common causes, most likely first

Worn or misadjusted clutch pedal position sensor linkage or pivot.
Contaminated or failing clutch pedal position sensor (dirt, oil, or internal wear).
Damaged or chafed wiring between the sensor and the ECM, often near the pedal box.
Loose, corroded, or backed-out electrical connector at the sensor or ECM.
A faulty clutch pedal position sensor that has drifted out of calibration.
Aftermarket floor mats or pedal covers that restrict full pedal travel.
Rarely, an internal ECM fault or software issue affecting the sensor signal processing.

How to diagnose and fix it

Inspect the clutch pedal for obstructions and verify it moves smoothly through its full travel without binding.
Check the sensor connector for corrosion, tightness, and damaged pins; clean and reseat as needed.
Measure the sensor reference voltage and ground at the connector with a digital multimeter, comparing to manufacturer specifications.
Back-probe the sensor signal wire and observe the voltage change as the pedal is slowly pressed and released, looking for smooth progression without drops or spikes.
Check for continuity and short circuits in the wiring harness between the sensor and the ECM, flexing the harness to reveal intermittent faults.
If the signal is erratic or out of range, replace the clutch pedal position sensor and perform any required calibration or relearn procedure.
Clear the code and test-drive the vehicle through several complete clutch cycles to confirm the repair and ensure the code does not return.

Clutch sensor faults that fool good technicians

A worn clutch pedal bushing or a bent pedal arm can cause the sensor to read incorrectly even when the sensor itself is perfectly good, so always inspect the pedal assembly first.
Aftermarket floor mats or thick winter mats that prevent the clutch pedal from reaching the floor can set this code by limiting the sensor's travel range.
Intermittent wiring faults inside the harness near the pedal box often only appear when the engine is running and the vehicle is moving, so a static voltage check may pass while the code still sets.
On some vehicles, a failing clutch switch can cause the ECM to disable cruise control or remote start without any driveability complaint, leading owners to overlook the clutch circuit entirely.
The code can be stored by a low battery or a voltage spike during jump-starting, so always check for a stable power supply and clear the code before condemning the sensor.

Can I keep driving with P08A8?

You can usually drive the vehicle, but avoid relying on cruise control and be prepared for possible stalling or a no-start condition if the fault worsens. Have the clutch pedal position sensor circuit inspected soon, especially if the engine has stalled or failed to start.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.