P0A71Generator Phase U 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
- P0A71 is set when the current in phase U of the hybrid generator exceeds its permitted level. No manufacturer documents P0A71 publicly. The Toyota patent on current sensor monitoring applies directly, since its machine also runs as an engine-driven generator and starts the engine: a sensor stuck too low makes the controller push the real current far above command, and an overcurrent through the inverter can damage its switches, so the relays are opened. A real overcurrent can also come from a winding or insulation short in the generator or a shorted switch. CARB requires monitoring of electric drive components. P0A70 is the low side, P0A74 and P0A77 phases V and W, P0A6F the general code. The hybrid system usually shuts down.
- What you may notice
- Master warning or hybrid warning with MIL
- Hybrid system shuts down; vehicle may not move or restart
- Likely causes
- PossibleShorted power switch in the generator phase U leg
- PossibleWinding or insulation short in generator phase U
- PossibleFaulty phase U current sensor or its evaluation in the inverter
- 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.