P0EB3A/C Compressor Motor Phase U Current Sensor Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EB3 means the phase U current signal has fallen below its permitted range. Depending on the sensor design this looks like a large negative current or like no signal at all; either way the controller can no longer trust the U-phase value it needs to drive the motor smoothly. No maker documents P0EB3 publicly. In GM's 2011 Volt, a phase U reading of minus 68 A or lower with the compressor at rest set the older code P0D7B, Type B with MIL after two trips, and a 12 V reset was needed before the test could pass again. Likely causes are a ground short in the sensing path, lost sensor supply or an internal inverter fault. Cooling stays off until the fault clears. Counterpart: P0EB2; the same fault on V and W: P0EB6, P0EB9.
- What you may notice
- Air conditioning inoperative
- Fault message after switching the A/C on
- Likely causes
- PossiblePhase U sensing path shorted to ground
- PossibleSupply to the phase U sensor missing
- PossibleInternal fault in the compressor inverter
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.