Powertrain, generic · Hybrid propulsion

P0D7A A/C Compressor Motor Phase U Current Low

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

Electric A/C compressors run a three-phase motor whose phase currents U, V and W are measured inside the inverter. P0D7A belongs to phase U. GM's 2011–2015 Volt and 2016 ELR test the sensors while the motor is stopped and the speed request is zero, when no current should flow: a phase U reading of +68 A or more in 30 of 60 samples at 50 ms sets P0D7A, Type B with MIL after two trips, and a 12 V reset is needed before it can pass again. In other words, GM uses the code for a current-sensor offset at standstill rather than for weak current during operation. The cause lies in the inverter's current sensing; the compressor normally stops. The negative counterpart is P0D7B, other phases P0D7C and P0D7E.

Likely causes

Offset or failure of the phase U current sensor in the inverter
Fault in the inverter's current measuring circuit

Symptoms

  • Check engine light after two trips
  • Air conditioning does not start

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 uinverter

Related codes

P0D7BP0D7CP0D7EP0D6F

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, patents.google.com.