[SOLVED] P0A78 Code: Drive Motor ‘a’ Inverter Performance – Troubleshooting And Fix

The automobile fault code P0A78 indicates a problem with the Inverter With Converter Assembly.

The most common symptom is the Engine Light being ON or the Service Engine Soon Warning Light.

This fault code can be caused by a faulty Inverter With Converter Assembly, an open or shorted harness, or a poor electrical connection in the circuit.

To fix this issue, you should visually inspect the wiring harness and connectors for any damage.

Look for broken, bent, pushed out, or corroded pins in the connectors.

The repair time for this fault code is estimated to be around 1.0. It is important to address this issue promptly to prevent further damage to the vehicle’s electrical system.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p0a78 fault code.

  • The symptoms of the automobile fault code p0a78 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p0a78 can be caused by a faulty inverter with converter assembly, an open or shorted harness, or a poor electrical connection in the circuit.

  • The fault code p0a78 can be caused by a faulty Inverter With Converter Assembly, an open or shorted Inverter With Converter Assembly harness, or a poor electrical connection in the Inverter With Converter Assembly circuit.

To fix the automobile fault code p0a78, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p0a78, start by checking the possible causes mentioned above.
  • Then, visually inspect the wiring harness and connectors for any damage.
  • Look for broken, bent, pushed out, or corroded pins on the connectors.
  • This fix should take approximately 1.0 hour.

The factors influencing the cost of diagnosing and fixing the automobile fault code p0a78 are the estimated repair time and the hourly rate charged by auto repair shops. The estimated repair time for this fault code is 1.0 hour.

Auto repair shops typically charge between $75 and $150 per hour for their services.

These factors will determine the overall cost of diagnosing and fixing the p0a78 fault code.

The P0A78 fault code refers to a performance issue with the drive motor ‘A’ inverter. The inverter is responsible for converting the high-voltage direct current from the HV battery into alternating current for the MG1MG2 motors. It contains a three-phase bridge circuit with power transistors for each motor, allowing it to convert the current effectively.

The HV control ECU controls the activation of these power transistors. The inverter also transmits important information, such as amperage and voltage, to the HV control ECU for proper control. The motor inverter current sensors detect the amperage flowing between the inverter and MG1MG2 motors.

If the HV control ECU detects a malfunction in the sensor system, it triggers the P0A78 fault code.

What are the possible causes for the automobile fault code p0a78?

If you see the engine light or service engine soon warning light on, the fault code P0A78 could be the culprit. This code is often caused by a faulty inverter with converter assembly, an open or shorted harness, or a poor electrical connection in the inverter with converter assembly circuit. To fix this issue, start by visually inspecting the wiring harness and connectors. Look for any signs of damage or corrosion, and check for broken, bent, pushed out, or corroded pins in the connectors.

How can I visually inspect the wiring harness and connectors to fix the fault code p0a78?

If you’re dealing with the fault code p0a78 and your engine light is on, it’s time to take a closer look at the wiring harness and connectors. The cause could be a faulty Inverter With Converter Assembly or an open or shorted harness. To fix it, visually inspect the wiring harness and connectors for any signs of damage. Check for broken, bent, pushed out, or corroded pins on the connectors. Don’t forget to also check for any damaged components.

What should I look for when checking for damaged components and connector’s pins to resolve the fault code p0a78?

When dealing with the fault code p0a78, it’s important to address the symptoms and causes effectively. If you notice the Engine Light ON or the Service Engine Soon Warning Light, the issue may lie with a faulty Inverter With Converter Assembly or an open/shorted harness. To resolve this, visually inspect the wiring harness and connectors, paying close attention to any damaged components. Look out for broken, bent, pushed out, or corroded connector’s pins. This thorough examination will help identify and rectify the problem.

p0a78 error fault code explained

To fix the p0a78 fault code, start by visually inspecting the wiring harness and connectors related to the Inverter With Converter Assembly. Look for any damage or corrosion.

Check for broken, bent, or pushed out pins on the connectors. Address any issues found to resolve the problem.

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