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P0A72 fault code: what it means

P0A72: Generator phase V current fault on Lexus GS450h/LS600h: abnormal current in one generator phase.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. inverter power transistor fault
  2. damaged HV cable or terminal
  3. generator winding fault

P0A72 by make

Lexus

Generator phase V current fault on Lexus GS450h/LS600h: abnormal current in one generator phase.

Usual causes: inverter power transistor fault; damaged HV cable or terminal; generator winding fault

Toyota

Generator (MG1) phase V current fault: abnormal current in one generator phase. Engine may not start; hybrid system shuts down.

Usual causes: inverter power transistor fault; damaged high-voltage cable or terminal; MG1 winding fault

Not sure what P0A72 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.