P08ACClutch Pedal Position Not Learned
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The engine controller has to know at which pedal position the clutch is fully released or disengaged. GM teaches the fully applied position at the factory and then adapts it over time to clutch wear. P08AC is set when this learned value falls outside a window (LV7 1.4 L: 7–33 %, 2019 Corvette ZR1: 9–36 % of travel) or when the manufacturer's enable counter shows the learn was never completed; 250 ms loop, Type A, MIL after one trip. Before 2018 GM used P080A. After replacing the sensor, pedal parts, clutch or ECM, a relearn with a scan tool is needed; FCA, for example, issued a Renegade bulletin calling for a clutch pedal sensor learn. Circuit faults (P08A9/P08AA) must be cleared first.
- What you may notice
- Malfunction indicator lamp on
- Start-stop, cruise control or automatic parking brake release not working as expected
- Likely causes
- LikelyRelearn not performed after replacing the sensor, clutch parts or engine control module
- PossibleLearned position drifted out of the allowed window (worn clutch, wrong pedal stop, air in hydraulics)
- PossibleLearn procedure aborted, for example by low battery voltage
- RareFaulty or misaligned clutch pedal sensor preventing a valid learn
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.