P0EA8A/C Compressor Motor Voltage Sensor B Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- 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.
- What you may notice
- Air conditioning does not cool
- Fault message for the climate system
- Battery cooling via refrigerant may be unavailable during charging
- Likely causes
- PossibleInterrupted voltage sense path inside or at the compressor
- PossibleFault on the compressor's inverter or control board
- RarePoorly seated high-voltage or signal connector at the compressor
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.