P2E21Drive Motor A Phase Y Current Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2E21 records that the phase Y current sensor of drive motor A reports a value under the bottom of its scale. No manufacturer documents P2E21 publicly. GM's eAssist logic shows a clean way to test for this: the low and high checks of its U and W sensors run while PWM output is disabled, so the inverter is not switching and no phase current can flow. A reading below -440 A in 4 of 6 samples, one every 10.4 ms, then sets the U-phase code as two-trip Type B. Anything that far out at rest can only come from the measuring chain, for example a grounded signal line or a dead sensor supply. Too little real current in phase Y is a different fault, P2C6D. In a Mitsubishi Electric design, X, Y and Z form the second star-connected set. High side: P2E22; X and Z low: P2E1D, P2E25.
- What you may notice
- Hybrid warning lamp and MIL
- Electric drive limited
- Engine runs more often than usual on hybrids
- Likely causes
- LikelyPhase Y sensor signal shorted to ground
- PossibleSensor supply voltage missing
- PossiblePhase Y current sensor failed
- 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.