P2E80 code meaning
A/C Compressor Control Module Internal Temperature Sensor B Circuit Intermittent/Erratic
What P2E80 means
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.
P2E80 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E80
- A/C cuts out and recovers sporadically
- Fault may be stored without any noticeable effect
Common causes of P2E80
- Most likelyLoose contact or cold solder joint in the sensor B circuit
- PossibleElectrical interference from the inverter switching on the measuring line
- Less likelyFluctuating 12 V supply or ground of the compressor controller
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac compressor cm internal temp sensor bAc compressor module
What each part of P2E80 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 80 | The exact fault in that area. |
What to do next
- Note P2E80 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2E80
What does P2E80 mean?
P2E80 means "A/C Compressor Control Module Internal Temperature Sensor B Circuit Intermittent/Erratic". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E80?
P2E80 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2E80 fail an emissions test?
P2E80 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2E80 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P2E80 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.