Powertrain, generic

P0EB9 A/C Compressor Motor Phase W Current Sensor Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0EB9 is stored when the phase W current signal drops beneath its lower limit, for instance after the signal wire has made contact with ground or after the sensor has lost its feed. The value is then useless for motor control, and the compressor module shuts the drive down rather than run it on two phases of information. No manufacturer documents P0EB9 publicly. GM's 2011 Volt shows a comparable test: minus 68 A or lower on phase W at standstill set the older code P0D7F, rated Type B with MIL after two trips. Because the sensing sits inside the compressor, repair usually means replacing the compressor assembly once wiring and high-voltage plugs have been checked. High range: P0EB8; plausibility: P0EBA; general W circuit: P0EC0.

Likely causes

Phase W measuring line shorted to ground
Phase W sensor without supply
Defect of the W measurement inside the compressor module

Symptoms

  • No cooling, compressor silent
  • Climate fault indicated

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 w current sensorac compressor module

Related codes

P0EB8P0EBAP0EC0P0EB3P0EB6P0D7F

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