P0EA9A/C Compressor Motor Voltage Sensor B Circuit Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EA9 means the B voltage reading reported by the electric A/C compressor looks electrically valid but does not fit other information, usually the high voltage reported by the battery system that feeds the compressor directly. No manufacturer documents P0EA9 publicly. The matching check on sensor A (P0D69) shows typical limits: Mitsubishi's 2019 Outlander PHEV flags a gap of 20 V or more lasting 2 s once the compressor sees 205 to 415 V, the battery is above 15 °C and intake air above 0 °C; GM's 2011 Volt uses more than 15 V in 35 of 40 samples. Mitsubishi names the data bus, the compressor assembly and the hybrid ECU as causes, and a drifting measurement inside the compressor is just as likely for channel B. Hard circuit faults of sensor B are P0EA8, P0EAA and P0EAB.
- What you may notice
- Air conditioning switches off or works only now and then
- Fault often recorded without any other symptom
- Likely causes
- LikelyDrifting voltage measurement inside the compressor module
- PossibleFaulty data exchange between compressor and hybrid controller
- RareWrong battery voltage reference from the hybrid or battery controller
- 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.