Powertrain, generic (extended)

P2E26 Drive Motor A Phase Z Current Sensor Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2E26 reports a phase Z current sensor signal of drive motor A that sits above its permitted range. No manufacturer documents P2E26 publicly. The consequence goes beyond one lost reading: in GM's eAssist table the overcurrent check P0C01 and the missing-phase check P0C05 only run while no current sensor code is active, and current control falls back to a mode that ignores the sensors. The inverter therefore loses part of its own protection and has to hold back torque. GM's U-phase high limit there is 440 A, two-trip Type B. Causes on the measuring side include the signal touching the supply line or an interrupted ground return; true overcurrent in phase Z is P2C71. A Mitsubishi Electric patent names Z as the third phase of a separately controlled second set. Low side: P2E25.

Likely causes

Phase Z signal shorted to the sensor supply

Open ground of the phase Z sensor

Phase Z current sensor failed high

Symptoms

Hybrid warning lamp and MIL
Electric drive torque clearly reduced
Vehicle continues only in a reduced-power mode

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 z current sensorwiring harnesshybrid control module

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