P0A71 code meaning
Generator Phase U Current High
Powertrain system Generic code P0Axx codes Check engine light
What P0A71 means
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.
P0A71 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1.5 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0A71
- Master warning or hybrid warning with MIL
- Hybrid system shuts down; vehicle may not move or restart
Common causes of P0A71
- 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Generator phase uInverter
What each part of P0A71 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 71 | The exact fault in that area. |
What to do next
- Note P0A71 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0A71
What does P0A71 mean?
P0A71 means "Generator Phase U Current High". P0A71 is set when the current in phase U of the hybrid generator exceeds its permitted level. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A71?
Drive gently and only to a workshop. With P0A71 the car can go into limp mode (reduced power) to protect itself.
Will P0A71 fail an emissions test?
Yes, it can. P0A71 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0A71 to fix?
Difficulty: workshop only. A typical repair takes 1.5 to 10 hours of work. This is a job for a workshop.
Will P0A71 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.