P0EB1A/C Compressor Motor Phase U Current Sensor Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- Electric A/C compressors run a three-phase permanent-magnet motor whose inverter measures the phase currents in order to commutate it and limit torque. P0EB1 is the general circuit fault of the phase U current sensor: the controller gets no usable signal and gives no finer verdict on it. P0EB1 is not described in any public maker document. GM's 2011 Volt checked the same sensors under the older codes P0D7A to P0D7F, testing at standstill with zero speed request; any reading of 68 A or more in either direction (30 of 60 samples, 50 ms) counted as a sensor fault, Type B, and only a 12 V reset allowed a new pass. The sensor belongs to the inverter, so the usual repair is the compressor assembly. U-phase details: P0EB2 to P0EB4.
- What you may notice
- Compressor does not run, cabin stays warm
- Climate system warning
- Likely causes
- LikelyFailed phase U current sensor in the compressor inverter
- PossibleOpen signal path between sensor and inverter controller
- RareFault on the inverter control board
- 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.