Powertrain, generic · Hybrid propulsion

P0D72 A/C Compressor Control Module Internal Temperature Sensor A Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P0D72 is the high-signal circuit code for the compressor module's internal temperature sensor. With the usual NTC thermistor a high signal means the reading looks extremely cold, and that is how GM defines it: every Volt and ELR table from 2011 to 2019 sets it when the reported CPU temperature is below −40 °C. Timing is 30 of 60 samples at 50 ms in the first-generation Volt, 40 of 50 at 100 ms in 2016 and 4 of 5 s in 2019, each Type B with MIL after two trips; the older tables only check with outside air above −7 °C. In the J2012 list this High code comes before the Low code P0D73. Typical cause is an open sensor path or a cracked solder joint on the compressor board, so the assembly is usually replaced.

Likely causes

Open circuit in the internal temperature sensor path
Cracked solder joint on the compressor electronics board
Faulty value transmission to the host controller

Symptoms

  • Check engine light after two trips
  • Air conditioning limited or switched off

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 cm internal temp sensor aac compressor module

Related codes

P0D73P0D71P0D70P0D74P0D77

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