P0A77

Generator Phase W Current High

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–556 (est.)

Symptoms

Check Engine light comes on
Reduced performance of the hybrid system
Possible problems with charging the traction battery
In some cases - a noticeable decrease in power

Causes

Phase W generator fault
Problems in the generator power circuit
Generator control power electronics malfunction
Short circuit in the generator windings
Damage to the wiring harness to the generator

How to Fix

Conduct diagnostics of the generator and its circuits
Check the condition of the wiring harness and connectors
Test the power electronics control unit
If necessary, replace the generator or its components
Repair only from an authorized dealer

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