Powertrain, generic (extended)

P2E7C A/C Compressor Control Module Internal Temperature Sensor B Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E7C covers the second internal temperature sensor in the control electronics of an electric A/C compressor. Their inverter sits on the housing: a Mitsubishi Heavy Industries patent places a sensor next to the power switches, Denso measures at the switches and at the motor stator, and TI's compressor inverter reference feeds IGBT temperature back for overheat protection. The maker decides what B denotes; GM already uses separate code blocks for its CPU sensor (P0D70) and IGBT sensor (P0D75). No manufacturer documents P2E7C publicly. As the generic circuit code it only says that no usable reading arrives, with neither a low nor a high signal identified. The compressor may limit speed or shut down; since the sensor is soldered to the board, repair normally means a complete compressor.

Likely causes

Sensor B or its circuit on the compressor control board defective
Compressor controller fails to evaluate or transmit the value
Unstable 12 V supply, ground or data link to the compressor

Symptoms

  • A/C cools weakly or switches off
  • On plug-in hybrids and EVs, battery cooling and fast charging may be limited
  • Warning message on the climate display; MIL depends on the manufacturer

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 bac compressor module

Related codes

P2E7DP2E7EP2E7FP2E80P0D70P0D75

References: law.cornell.edu, image-ppubs.uspto.gov, image-ppubs.uspto.gov, ti.com.