P2E80A/C Compressor Control Module Internal Temperature Sensor B Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- With P2E80 the controller sees the reading of sensor B, a second internal thermometer in the compressor electronics, flicker: values leap or vanish for an instant and then look normal again. Set criteria for P2E80 are not published by any manufacturer. For the 2019 Volt, GM lists the IGBT counterpart P0D79 merely as a code that must be inactive before its rationality check P0D76 starts. A Hyundai patent dealing with sensors on inverter power switches separates the patterns: dropouts spread irregularly over time point to bad contact, whereas a value stuck at one number suggests a short. Loosened board connectors, cold solder joints and interference are prime suspects. Rule out the low-voltage feed, ground and network line first; when the fault stays, the compressor assembly is normally replaced as one unit.
- What you may notice
- A/C cuts out and recovers sporadically
- Fault may be stored without any noticeable effect
- Likely causes
- LikelyLoose contact or cold solder joint in the sensor B circuit
- PossibleElectrical interference from the inverter switching on the measuring line
- RareFluctuating 12 V supply or ground of the compressor controller
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.