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P0A77 Powertrain

Generator Phase W Current High

Phase W current of the generator exceeds the expected window. Indicates phase short or stalled rotor.

Affected components

  • Generator phase w
  • Inverter

Common causes

  • High likelihood: Short between motor phases
  • Medium likelihood: Rotor stalled - high stall current

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • Reduced-power or limp mode may occur

Related codes

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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