Powertrain, generic · Hybrid propulsion

P0D6B A/C Compressor Motor Voltage Sensor A Circuit Low

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P0D6B reports that the high-voltage input reading of the electric A/C compressor sits below the plausible range. GM's first-generation Volt (2011–2015) and the 2016 ELR set it at 190 V or less in 30 of 60 samples at 50 ms, checked only with the contactors closed for over a second and fault-free. The 2016–2019 Volt uses below 27.75 V, judged by the compressor and passed on over GMLAN (2019: 4 of 5 s); all are Type B, MIL after two trips. Mitsubishi's Outlander PHEV flags under 205 V for 2 s while the battery shows 220 to 400 V; the 2019/2022 page header mislabels it as high, but the threshold is a low one, and the 2023 list calls it Circuit Low with MIL only. Suspects: compressor inverter, CAN link, hybrid ECU. A real supply loss is P0D6D.

Likely causes

Voltage measurement in the compressor inverter reads too low
Faulty data link between compressor and hybrid controller (named by Mitsubishi)
Hybrid or vehicle controller evaluates the value incorrectly

Symptoms

  • Check engine light after two trips (GM) or immediately (Mitsubishi 2023)
  • Air conditioning stops cooling
  • Battery cooling via refrigerant may be restricted

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–5 h

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

Parts involved

ac compressor motor voltage sensor awiring harnessac compressor module

Related codes

P0D6AP0D69P0D68P0D6CP0D6D

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