Powertrain, generic · Hybrid propulsion

P0D75 A/C Compressor Control Module Output Driver Temperature Sensor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The output driver temperature sensor watches the power transistors (IGBTs) that switch the three motor phases of an electric A/C compressor; they heat up under load, and the compressor reduces speed or stops before they overheat. P0D75 is the general circuit code for this sensor without a defined low or high value. No manufacturer documents P0D75 publicly; GM's Volt and ELR use P0D76 to P0D78 for the same sensor and mention P0D79 in enable conditions. A Denso patent on hybrid compressor control describes throttling the compressor when the IGBT module runs hot, which is why losing this signal normally halts it. CARB requires such thermal-management inputs to be monitored. The sensor is built into the inverter, so repair usually means a new compressor.

Likely causes

Temperature sensor at the IGBT module or its circuit failed
Sensor value not transmitted correctly to the vehicle
Unstable 12 V supply or ground of the compressor electronics

Symptoms

  • Air conditioning switched off
  • Battery cooling via refrigerant may be limited

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 output driver temp sensorac compressor module

Related codes

P0D76P0D77P0D78P0D79P0D70

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