Powertrain, generic · Hybrid propulsion

P0A6F Generator Phase U Current

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Generator phase U current sensor failed
Fault in the generator section of the inverter assembly
Generator phase U cable or terminal faulty

Symptoms

  • Hybrid system warning and MIL
  • Engine cannot be started electrically or battery is no longer charged

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–6,000
Time1.5–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

generator phase uinverter

Related codes

P0A70P0A71P0A72P0A75P0A59

References: patents.google.com, patents.google.com, law.cornell.edu.