P0EA8 code meaning
A/C Compressor Motor Voltage Sensor B Circuit
What P0EA8 means
P0EA8 is the general circuit code for the second high-voltage measurement of an electric A/C compressor, labelled sensor B. Such compressors draw their power from the traction battery and convert it in a built-in inverter; the module reads the supply voltage to control the motor and protect its power stage. Here the B signal is missing or unusable as a whole, without being classed as low, high or implausible. No manufacturer documents P0EA8 publicly, and nobody states which point sensor B measures. For the A channel, GM's 2011 Volt tables show how such inputs are judged (P0D6A at 440 V or more, P0D6B at 190 V or less, each Type B). CARB demands circuit checks on inputs that hybrid battery cooling relies on. Expect the compressor to stop; specific faults are P0EA9 to P0EAC.
P0EA8 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0EA8
- Air conditioning does not cool
- Fault message for the climate system
- Battery cooling via refrigerant may be unavailable during charging
Common causes of P0EA8
- PossibleInterrupted voltage sense path inside or at the compressor
- PossibleFault on the compressor's inverter or control board
- Less likelyPoorly seated high-voltage or signal connector at the compressor
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac compressor motor voltage sensor bAc compressor moduleWiring harness
What each part of P0EA8 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A8 | The exact fault in that area. |
What to do next
- Note P0EA8 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 P0EA8
What does P0EA8 mean?
P0EA8 means "A/C Compressor Motor Voltage Sensor B Circuit". P0EA8 is the general circuit code for the second high-voltage measurement of an electric A/C compressor, labelled sensor B. It is a generic code, so it means the same on every make.
Is it safe to drive with P0EA8?
P0EA8 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0EA8 fail an emissions test?
P0EA8 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0EA8 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0EA8 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.