Powertrain, generic

P0EB1 A/C Compressor Motor Phase U Current Sensor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Failed phase U current sensor in the compressor inverter
Open signal path between sensor and inverter controller
Fault on the inverter control board

Symptoms

  • Compressor does not run, cabin stays warm
  • Climate system warning

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–2,500
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ac compressor motor phase u current sensorac compressor module

Related codes

P0EB2P0EB3P0EB4P0EBBP0EC0P0D7A

References: gsi.ext.gm.com, law.cornell.edu.