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Engine-Codes – Generic – P0C79

P0C79 Code - Drive Motor 'A' Inverter Voltage Too High

Quick Answer

The diagnostic trouble code P0C79 indicates that the drive motor 'A' inverter voltage is too high. Common causes include Faulty inverter, Malfunctioning sensor, Loose or corroded electrical connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0C79 indicates Drive Motor 'A' Inverter Voltage Too High.
Common causes
Common causes include Faulty inverter, Malfunctioning sensor, Loose or corroded electrical connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P0C79 Description

The diagnostic trouble code P0C79 indicates that the drive motor 'A' inverter voltage is too high. In hybrid and electric vehicles, the drive motor inverter is responsible for converting the DC power from the battery into AC power to drive the electric motor. When the voltage at the inverter is too high, it can lead to various performance issues and potentially damage the vehicle's electrical system.

OBDII Code P0C79 - Drive Motor 'A' Inverter Voltage Too High
P0C79 Code - Drive Motor 'A' Inverter Voltage Too High

Common Causes of P0C79

  1. Faulty inverter
  2. Malfunctioning sensor
  3. Loose or corroded electrical connections
  4. Overvoltage from the battery
  5. Issues with the electric motor

Symptoms of P0C79

  1. Reduced power output
  2. Erratic behavior in the electric motor
  3. Poor acceleration
  4. Warning light illuminated on the dashboard
  5. Vehicle going into limp mode

How to Fix P0C79

  1. Begin by diagnosing the root cause of the issue using a diagnostic scan tool to pinpoint the source of the high voltage.
  2. Inspect the inverter for any visible signs of damage or malfunction. Replace the inverter if necessary.
  3. Check the sensor readings and replace any faulty sensors that are providing incorrect voltage readings.
  4. Inspect all electrical connections for looseness or corrosion. Clean or tighten connections as needed.
  5. Reset the fault code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0C79

The typical repair costs for addressing a drive motor 'A' inverter voltage too high issue can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the cost can range from $500 to $1500, including parts and labor. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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