Powertrain, generic (extended)

P2E1B Drive Motor A Phase X Current Sensor Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2E1B reports an electrical fault in the circuit of the phase X current sensor of drive motor A, without a separate low or high verdict. X, Y and Z name a second three-phase winding group: a Mitsubishi Electric patent on two-group motors for hybrid drives couples one current sensor to the conductor of each of the six phases. No manufacturer documents P2E1B publicly. Ford's 2019 hybrids supervise a reference voltage for the motor current sensors and flag it outside 4.5 to 6 V for 500 ms; a fault there would hit every phase at once. CARB allows a sensor mounted on a board inside a control unit to report wiring and range faults under one shared code, so P2E1B may stand in for P2E1D and P2E1E. Since the sensor sits in the inverter, the repair is usually that unit.

Likely causes

Phase X current sensor in the inverter failed

Reference supply or ground of the current sensors faulty

Loose or corroded low-voltage connector at the inverter

Defect on the motor control board that evaluates the sensor

Symptoms

Hybrid system warning lamp and MIL
Reduced electric drive or no electric drive
Rough or noisy motor operation under load

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 sensorwiring harnesshybrid control module

References: image-ppubs.uspto.gov, fordservicecontent.com, law.cornell.edu.