P2C71Drive Motor A Phase Z Current High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2C71 reports overcurrent in phase Z of drive motor A, the last phase of the second winding set. No manufacturer documents P2C71 publicly. Once overcurrent is detected the inverter has to bring the machine into a safe state, and the Mitsubishi Electric patent on dual-winding drives deals with exactly that: when the battery link opens, each winding set is moved in steps from a phase short circuit to all switches off, at different times, so that the voltage induced by the spinning rotor cannot damage the inverter. For the driver this means a sudden loss of drive power and a warning. Ford's limits for the U/V/W case, 600 A for 400 microseconds, show how fast such checks are. Suspect a shorted switch, a winding or lead short, or a sensor error. P2C70 is the low side, P2C6B and P2C6E are X and Y.
- What you may notice
- Sudden loss of drive power with hybrid or drive warning
- MIL on, vehicle may not restart into ready mode
- Likely causes
- PossibleShorted power semiconductor in the Z leg
- PossibleShort in the phase Z winding or lead, to another phase or ground
- PossiblePhase Z current sensor reading too high or noisy
- RareInverter control software reacting wrongly to transients
- 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: €400 – €7,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.