P2E7E code meaning
A/C Compressor Control Module Internal Temperature Sensor B Circuit High
Powertrain system Generic code P2Exx codes Check engine light
What P2E7E means
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.
P2E7E at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2E7E
- Compressor runs restricted or not at all
- Cabin and, where present, battery cooling weaker
- MIL possible after two drive cycles depending on manufacturer
Common causes of P2E7E
- Most likelySensor B path open, e.g. cracked solder joint on the board
- PossibleReference or ground of the measuring circuit lost inside the module
- Less likelyAnalog input of the compressor controller defective
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 P2E7E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7E | The exact fault in that area. |
What to do next
- Note P2E7E 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 P2E7E
What does P2E7E mean?
P2E7E means "A/C Compressor Control Module Internal Temperature Sensor B Circuit High". P2E7E reports that internal temperature sensor B of the A/C compressor controller delivers a signal above its valid range. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E7E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2E7E fail an emissions test?
P2E7E 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 P2E7E to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P2E7E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.