Powertrain, generic · Hybrid propulsion

P0D70 A/C Compressor Control Module Internal Temperature Sensor A Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The control electronics inside an electric A/C compressor carry a temperature sensor on the processor board, called internal sensor A; the compressor uses it to protect itself and reports the value to the vehicle. P0D70 is the general circuit code for it: the value is missing or invalid without a defined low or high reading. No manufacturer documents P0D70 publicly. GM's Volt and ELR tables only use P0D71 (comparison with other temperatures), P0D72 (below −40 °C) and P0D73 (above 150 or 274 °C) for this sensor. A Hyundai patent on temperature sensors of power electronics lists open connectors, shorts, noise and board faults as the usual origins. As the sensor sits on the module's circuit board, a confirmed fault usually means a new compressor assembly; cooling may be reduced or stop.

Likely causes

Temperature sensor or its circuit on the compressor board failed
Value not transmitted correctly over the data link
Unstable 12 V supply or ground of the compressor electronics

Symptoms

  • Air conditioning weak or off
  • Battery cooling via refrigerant may be limited
  • Warning depending on the vehicle

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

P0D71P0D72P0D73P0D74P0D75

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