Powertrain, generic

P0EB2 A/C Compressor Motor Phase U Current Sensor Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0EB2 is set when the phase U current sensor of the electric A/C compressor sends a signal above its valid window. Current sensors in such inverters often output a voltage centred on zero current, so a stuck-high output reads like a large current in one direction even with the motor at rest. No manufacturer documents P0EB2 publicly. GM's 2011 Volt ran a standstill test that catches exactly this: plus 68 A or more on phase U with no speed request set the older code P0D7A, Type B. A short to the sensor supply, a damaged Hall element or a fault on the inverter board are typical. The compressor controller stops the motor to protect the power stage. P0EB3 covers the low side; P0EB5 and P0EB8 report the same fault on phases V and W.

Likely causes

Damaged Hall element of the phase U sensor
Phase U signal shorted to the sensor supply
Defect on the inverter board affecting the U channel

Symptoms

  • Compressor will not start or stops at once
  • No cooling during hot weather

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

P0EB3P0EB1P0EB4P0EB5P0EB8P0D7A

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