P0EACA/C Compressor Motor Voltage Sensor B Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EAC points to a B voltage signal that jumps or drops out for short moments instead of staying wrong. The module sees sudden changes no real battery voltage can make, or values that come and go. Loose high-voltage or signal connectors at the compressor, vibration damage to the harness, moisture in a plug and internal contact problems on the inverter board are the usual suspects. No manufacturer documents P0EAC publicly; GM and Mitsubishi only publish steady range and plausibility checks for the A channel (P0D6A, P0D6B, P0D69). The fault may vanish after a restart and return with vibration or temperature changes. Wiggle tests are only allowed after the high-voltage circuit is isolated and verified dead. Steady faults of the same sensor are P0EA8 to P0EAB.
- What you may notice
- Air conditioning cuts out briefly and then resumes
- Fault entry returns after clearing
- Likely causes
- LikelyLoose or corroded connector at the compressor
- PossibleHarness chafed or cracked by engine and road vibration
- RareCracked solder joint on the compressor control board
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.