P0A6F is the general fault code for the phase U current of the hybrid generator, the motor-generator that is mainly driven by the engine, starts it and charges the battery, such as Toyota's MG1 or Hyundai's hybrid starter-generator. No manufacturer documents P0A6F publicly; Toyota's published field reports show generator codes for phases V and W only. A Hyundai patent describes an inverter that senses two or three generator phase currents through its own sensors, separate from those of the drive motor. CARB requires monitoring of electric drive components. P0A70 and P0A71 are the low and high variants, P0A72 and P0A75 phases V and W, P0A59 the generator current sensor circuit. Without the generator, engine start and charging may fail.
Medium severity. Can I keep driving?If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
Symptoms
- Hybrid system warning and MIL
- Engine cannot be started electrically or battery is no longer charged
Most likely causes
- Generator phase U current sensor failed
- Fault in the generator section of the inverter assembly
- Generator phase U cable or terminal faulty
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- It can trigger limp mode.
- It affects emissions.
What each character of P0A6F means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- A: Hybrid or air and fuel
- 6F: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0A6F?
If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
What causes code P0A6F?
The most common causes are: generator phase U current sensor failed; fault in the generator section of the inverter assembly; generator phase U cable or terminal faulty.
Related codes
- P0A70Generator Phase U Current Low
- P0A71Generator Phase U Current High
- P0A72Generator Phase V Current
- P0A75Generator Phase W Current
- P0A59Generator Current Sensor Circuit
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.