Powertrain, generic (extended)

P2E7E A/C Compressor Control Module Internal Temperature Sensor B Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P2E7E reports that internal temperature sensor B of the A/C compressor controller delivers a signal above its valid range. Most sensors of this kind produce a voltage that falls as temperature rises; TI's compressor inverter reference uses such an analog part, so a high signal stands for an impossibly cold reading. GM applies exactly this to the IGBT sensor of its compressor: P0D77 sets when the reported value falls under −40 °C, in the 2011 Volt after 30 failures within 60 samples taken every 50 ms, provided ambient exceeds −7 °C, in 2018 at a 100 ms rate and in 2019 after 4 of 5 s, always Type B. No manufacturer documents P2E7E. An open sensor path, a cracked solder joint or a lost reference on the board are usual causes. In J2012 this High code precedes the Low code P2E7F.

Likely causes

Sensor B path open, e.g. cracked solder joint on the board
Reference or ground of the measuring circuit lost inside the module
Analog input of the compressor controller defective

Symptoms

  • Compressor runs restricted or not at all
  • Cabin and, where present, battery cooling weaker
  • MIL possible after two drive cycles depending on 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

P2E7FP2E7CP2E7DP0D72P0D77

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