P2E1CDrive Motor A Phase X Current Sensor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Hybrid warning lamp and MIL
- Electric drive limited, uneven torque at low speed
- Code returns after clearing at the next start
- Likely causes
- LikelyZero offset of the phase X sensor has drifted
- PossibleSensor gain error after ageing or overheating
- PossibleUnstable reference voltage for the current sensors
- RareFault in the measuring stage of the inverter control board
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.