P0A79 Fault Code

Drive Motor "B" Inverter Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0A79 fault code is triggered when the vehicle's control module detects an issue with the performance of the Drive Motor 'B' inverter. This inverter is responsible for converting DC power from the battery into AC power that drives the electric motor. Efficient operation of this component is crucial for the overall performance of the electric or hybrid vehicle.

What are the symptoms of the P0A79 code?

Drivers experiencing a P0A79 fault code may notice:

• Warning lights illuminated on the dashboard, indicating hybrid system failure.
• Reduced power output from the electric motor.
• Erratic behavior of the vehicle, such as sudden loss of acceleration.
• Loud or unusual noises coming from the inverter area.
• Battery management system alerts regarding performance issues.

What causes the P0A79 code?

Common causes for the P0A79 fault code include:

• Overheating of the inverter due to inadequate cooling.
• Electrical connections that are corroded or damaged.
• Malfunctioning sensors that provide feedback to the control module.
• Software issues within the vehicle’s control systems.
• A failing inverter assembly.

How to fix P0A79?

To resolve the P0A79 issue, technicians should:

• Conduct a thorough inspection of the inverter and related wiring for damage or corrosion.
• Check and replace faulty sensors that may be affecting inverter performance.
• Ensure proper cooling system operation; check coolant levels and flow.
• Update or re-flash the vehicle’s software if applicable.
• If necessary, replace the inverter assembly to restore performance.