Powertrain, generic · Hybrid propulsion

P0D7B A/C Compressor Motor Phase U Current High

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P0D7B is the second phase U current code of the electric A/C compressor. In GM's first-generation Volt (2011–2015) and the 2016 Cadillac ELR it sets when the phase U current sensor reads −68 A or less although the motor is stopped and no speed is requested, counted as 30 failures in 60 samples at 50 ms; Type B, MIL after two trips, with a 12 V reset required before a pass. A real current of that size at standstill is impossible, so the fault lies in the sensor or its evaluation on the inverter board, which normally means replacing the compressor. The A/C stays off while the code is active. GM's positive-direction code for the same phase is P0D7A; phases V and W use P0D7D and P0D7F.

Likely causes

Phase U current sensor reading negative at standstill
Fault in the inverter's current evaluation

Symptoms

  • Check engine light after two trips
  • Air conditioning stays off

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

P0D7AP0D7DP0D7FP0D6F

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