Powertrain, generic · Hybrid propulsion

P0D74 A/C Compressor Control Module Internal Temperature Sensor A Circuit Intermittent/Erratic

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D74 reports an unsteady signal from the internal temperature sensor of the A/C compressor control module: the reading jumps or drops out in short bursts rather than sitting at one wrong value. No manufacturer publishes a threshold for P0D74. GM's 2019 Volt table names it, together with P0D71 to P0D73, as a fault that blocks other compressor diagnostics, which ties it to the same sensor, but it gives no set criteria. A Hyundai patent on temperature sensors of power switches describes how loose connectors, noise, board defects or cold solder joints produce exactly such erratic values. Because the sensor is part of the compressor electronics, a confirmed fault usually ends with a new assembly; check the 12 V supply, ground and data connections first.

Likely causes

Cold or cracked solder joint on the compressor board
Loose low-voltage connector or ground at the compressor
Electrical interference on the sensor signal

Symptoms

  • Air conditioning cuts out now and then
  • Code appears sporadically

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–2,500
Time0.5–5 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

P0D70P0D71P0D72P0D73P0D79

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