P08A9Clutch Pedal Position Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The sensor is designed with dead bands at both ends, so a signal near 0 V can only come from a fault. GM sets P08A9 when the signal stays below 4 % of the 5 V reference (low voltage or open circuit) for 400 of 500 samples taken every 12.5 ms, with the engine not cranking and system voltage above 9 V (10 V in some 2018 tables); Type A, MIL after one trip. GM used P0807 for this before 2018 and lists P08A9 for the LV7, the 2019 Corvette ZR1 and its 2018 OBDG04 engines. Ford's 2020–23 gasoline summary uses P08A9 for cars with dual PWM pedal sensors or a single analog sensor plus switches, detected in under a second. The high-side counterpart is P08AA; sensor B low is P08B6.
- What you may notice
- Malfunction indicator lamp on after one trip
- Start-stop and cruise control unavailable
- Engine may refuse to crank on vehicles that release the starter via the sensor
- Likely causes
- LikelySignal wire chafed through and shorted to ground in the pedal area
- LikelyOpen signal wire or missing 5 V reference (connector off, broken wire)
- PossibleFailed clutch pedal position sensor A
- RareShared 5 V reference pulled down by another sensor on the same circuit
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €50 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.