P0A77
Generator Phase W Current High
P0A77 is an OBD-II diagnostic trouble code meaning: Generator Phase W Current High. Common causes: phase w generator fault, problems in the generator power circuit. Estimated repair cost: $167–556.
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
Related codes
Error P0A77 by Vehicle Brand
FAQ
What does the P0A77 code mean?
P0A77 is an OBD-II diagnostic trouble code that indicates: Generator Phase W Current High
What causes a P0A77 error code?
The most common causes of P0A77 include: Phase W generator fault; Problems in the generator power circuit; Generator control power electronics malfunction; Short circuit in the generator windings.
How do I fix a P0A77 diagnostic trouble code?
To fix P0A77: Conduct diagnostics of the generator and its circuits. Check the condition of the wiring harness and connectors. Test the power electronics control unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0A77?
Limited driving only, diagnose soon
How much does it cost to fix P0A77?
The estimated repair cost for P0A77 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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