Powertrain, generic (extended)

P2E27 Drive Motor A Phase X-Y-Z Current Sensor Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

One of the three X/Y/Z sensors drifted in offset or gain
Disturbed common reference of the current sensors
Leakage current from the X/Y/Z winding group to the housing
Motor control software calibration

Symptoms

  • Hybrid warning lamp and MIL
  • Electric drive limited or temporarily switched off
  • No single sensor code stored alongside

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–5,000
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor a phase x current sensordrive motor a phase y current sensordrive motor a phase z current sensor

Related codes

P0BFDP2E1CP2E20P2E24P2DCB

References: image-ppubs.uspto.gov, gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.