Powertrain, generic (extended)

P2E1C Drive Motor A Phase X Current Sensor Circuit Range/Performance

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2E1C means the phase X current sensor of drive motor A delivers a value that is electrically valid but implausible. No manufacturer documents P2E1C publicly; GM's U/V/W counterparts show the usual test, a zero check. While no current flows through the motor, the controller learns each sensor's offset: the 2016 Volt fails it above 30 A after 0.1 s, the Cadillac ELR in the same 2016 tables above 30 A within about 83 ms, a 2019 table above 35 A after 0.4 s, always Type A with MIL after one trip. A shifted zero distorts torque control and the phase balance. CARB wants rationality faults kept in a code of their own, apart from circuit and range faults (P2E1B, P2E1D, P2E1E). The X/Y/Z set only exists on motors with a second winding group. Sensor drift, heat damage or a weak reference are likely.

Likely causes

Zero offset of the phase X sensor has drifted

Sensor gain error after ageing or overheating

Unstable reference voltage for the current sensors

Fault in the measuring stage of the inverter control board

Symptoms

Hybrid warning lamp and MIL
Electric drive limited, uneven torque at low speed
Code returns after clearing at the next start

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: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.