P2E20Drive Motor A Phase Y 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
- P2E20 is set when the phase Y current sensor of drive motor A reads within its electrical limits but not believably. No manufacturer documents P2E20 publicly. Besides the zero check, a current balance can expose a sensor with a wrong gain. GM's eAssist table checks whether motor DC current and the input current of the accessory power module match the battery pack current; a mismatch above 40 A in 90 of 96 samples, taken every 2.08 ms, sets the U-V-W correlation code P0BFD as two-trip Type B. While a single sensor code is active, GM skips that balance and runs current control in a mode that does not rely on the sensors. The Mitsubishi Electric patent that defines X/Y/Z windings measures all six phase currents one by one. A drifting sensor or a disturbed reference is likely. X and Z range faults: P2E1C, P2E24.
- What you may notice
- Hybrid warning lamp and MIL
- Less electric assist, torque not as requested
- Motor whine or slight vibration
- Likely causes
- LikelyGain error of the phase Y sensor
- PossibleZero offset of the phase Y sensor shifted
- PossibleDisturbed reference voltage of the current sensors
- RareMotor control software needing an update
- 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.