P2E27 code meaning
Drive Motor A Phase X-Y-Z Current Sensor Correlation
Powertrain system Generic code P2Exx codes Check engine light
What P2E27 means
P2E27 compares the three current sensors of phases X, Y and Z of drive motor A with each other. Mitsubishi Electric's patent joins the X, Y and Z windings in a star, so their currents must add up to almost zero at every instant; a clear residual means at least one sensor is wrong, even if every reading passes its own checks. No manufacturer documents P2E27 publicly. GM's U-V-W counterpart P0BFD shows the limits: an absolute sum of 110 A for 0.02 s on the 2016 Volt or for 0.0032 s within 0.0038 s in a 2019 table, and above 156 A on the 2016 Cadillac ELR, all Type A. GM's eAssist skips its balance check while a single sensor code is set, because that code already names the culprit; the correlation alone cannot. Single faults: P2E1B to P2E26.
P2E27 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E27
- Hybrid warning lamp and MIL
- Electric drive limited or temporarily switched off
- No single sensor code stored alongside
Common causes of P2E27
- Most likelyOne of the three X/Y/Z sensors drifted in offset or gain
- PossibleDisturbed common reference of the current sensors
- Less likelyLeakage current from the X/Y/Z winding group to the housing
- Less likelyMotor control software calibration
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor a phase x current sensorDrive motor a phase y current sensorDrive motor a phase z current sensor
What each part of P2E27 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 27 | The exact fault in that area. |
What to do next
- Note P2E27 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 P2E27
What does P2E27 mean?
P2E27 means "Drive Motor A Phase X-Y-Z Current Sensor Correlation". P2E27 compares the three current sensors of phases X, Y and Z of drive motor A with each other. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E27?
Drive gently and only to a workshop. With P2E27 the car can go into limp mode (reduced power) to protect itself.
Will P2E27 fail an emissions test?
Yes, it can. P2E27 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2E27 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P2E27 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.