P08A9 code meaning
Clutch Pedal Position Sensor A Circuit Low
Powertrain system Generic code P08xx codes Check engine light
What P08A9 means
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.
P08A9 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P08A9
- 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
Common causes of P08A9
- Most likelySignal wire chafed through and shorted to ground in the pedal area
- Most likelyOpen signal wire or missing 5 V reference (connector off, broken wire)
- PossibleFailed clutch pedal position sensor A
- Less likelyShared 5 V reference pulled down by another sensor on the same circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Clutch pedal position sensor aWiring harnessECM
What each part of P08A9 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8 | Area: transmission. |
| A9 | The exact fault in that area. |
What to do next
- Note P08A9 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P08A9
What does P08A9 mean?
P08A9 means "Clutch Pedal Position Sensor A Circuit Low". The sensor is designed with dead bands at both ends, so a signal near 0 V can only come from a fault. It is a generic code, so it means the same on every make.
Is it safe to drive with P08A9?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P08A9 fail an emissions test?
Yes, it can. P08A9 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P08A9 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P08A9 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.