Powertrain, generic · Transmission

P08A8 Clutch Pedal Position Sensor A Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P08A8 flags a clutch pedal sensor whose signal is electrically valid but contradicts how the car is actually driving. GM uses it on manual cars since model year 2018 (before: P0806), e.g. the LV7 1.4 L engine and the 2019 Corvette ZR1 (LT5): when engine speed to output shaft speed shows that a gear is engaged and transmitting torque, but the pedal reads as pressed, the filtered position error must stay below 4 %. Enabled above 4.3 mph (LT5: 5.6 mph), not in 4WD low, torque above a table, no circuit, crank or speed sensor faults; Type A, MIL after one trip. Circuit faults are P08A9/P08AA. Typical result: start-stop and cruise control off, and the engine computer may misjudge clutch state.

Likely causes

Sensor loose or misaligned on the pedal bracket, so its reading no longer matches pedal travel
Worn or drifting sensor track giving an offset signal
Driver resting a foot on the clutch pedal, or a floor mat holding it down
Corroded connector adding resistance to signal or ground

Symptoms

  • Malfunction indicator lamp on
  • Start-stop and cruise control switched off
  • Rev-matching or hill-start functions may be disabled

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–350
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

clutch pedal position sensor awiring harnessecm

Related codes

P08A9P08AAP08ABP08ACP08B5P0806

References: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.