P0EAAA/C Compressor Motor Voltage Sensor B Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EAA flags a B voltage reading at the top of, or beyond, the plausible range of the compressor supply. Since the battery cannot really deliver that much, the cause usually lies in the measurement itself: an open or shorted sense path, a failed voltage divider inside the compressor or a wrong reference. No manufacturer documents P0EAA publicly. GM's 2011 Volt judges the A channel this way (P0D6A): 440 V or more in 30 of 60 samples taken every 50 ms, Type B with MIL after two trips; a single sample at 480 V or more triggers a separate maker code. A genuinely high bus voltage would also show up in battery and inverter codes, which helps to tell the two apart. The compressor normally shuts down; the low counterpart is P0EAB.
- What you may notice
- Compressor stops, cabin is not cooled
- Warning in the climate control display
- Likely causes
- LikelyFailed voltage divider or reference in the compressor module
- PossibleSense line shorted to a higher potential
- RareActual overvoltage on the high-voltage bus
- 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.