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.
Low severity. Can I keep driving?Yes, you can keep driving. The air conditioning may not work.
Symptoms
- Air conditioning does not cool
- Fault message for the climate system
- Battery cooling via refrigerant may be unavailable during charging
Most likely causes
- Interrupted voltage sense path inside or at the compressor
- Fault on the compressor's inverter or control board
- Poorly seated high-voltage or signal connector at the compressor
What to check, in order
Start with the simplest. You can tick off each step.
What each character of P0EA8 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- E: Subsystem depends on the code range
- A8: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0EA8?
Yes, you can keep driving. The air conditioning may not work.
What causes code P0EA8?
The most common causes are: interrupted voltage sense path inside or at the compressor; fault on the compressor's inverter or control board; poorly seated high-voltage or signal connector at the compressor.
Related codes
- P0EA9A/C Compressor Motor Voltage Sensor B Circuit Performance
- P0EAAA/C Compressor Motor Voltage Sensor B Circuit High
- P0EABA/C Compressor Motor Voltage Sensor B Circuit Low
- P0EACA/C Compressor Motor Voltage Sensor B Circuit Intermittent/Erratic
- P0D68A/C Compressor Motor Voltage Sensor A Circuit
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.