P0A79 - OBD Trouble Code

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You have probably found the P0A79 error code flashing and don’t worry you are at the right place to not just find out what this means but also to resolve the issue. the check engine light may also be on in such cases. You just need to know what that code talks about an accordingly fix it. The P0A79 code is set when the high voltage control module detects a problem with the inverter assembly.

The high-voltage current of the HV battery as well as alternating current is converted by the inverter. There’s a three-phase bridge circuit, this consists of 6 power transistors (for each MG1 and MG2). The ECU is the HV control unit, it also controls the actuation of the power transistors. All information transmitted via the inverter like amperage and voltage is passed to the Engine Control Unit. This amperage is detected by the motor inverter current sensors, and is monitored by the ECU. If it notices any malfunction in the sensor system it will proceed and set P0A79 code and the check engine light will also be turned on.

What causes this problem with the Drive Motor "A" Inverter Performance?

• Problematic Inverter With Converter Assembly
• Harness of the Inverter With Converter Assembly is open or shorted
• Inverter With Converter Assembly circuit shows unacceptable electrical connection

1. Inverter with Converter Assembly - Look for repairs and see If the P0A75 code is resolved after fixing the issues, otherwise you will have to replace the inverter with converter assembly.
2. Inverter with Converter Assembly Harness - Repair otherwise replace the harness if the repairs don’t solve the P0A75 code.
3. Engine Control Unit - Try to fix the issues with your ECU through repairs, if that’s not helping, you will have to opt for replacement. Order Online easily at Parts Avatar, simply select the ECU compatible with your vehicle's year of manufacture, make and model and place your order. We ship in just a matter of days!
4. Motor Inverter Current Sensors - Check if you can repair and fix the sensors otherwise go for replacement to get rid of P0A75 error.
5. Powertrain Control Module - Easily replace the PCM from Parts Avatar, order online and avail free shipping on orders above CAD $99, we don’t have any hidden shipping charges in our products, so worry not and order away!
6. Diagnostic Tools - Very important to have the best in hand for diagnosis, At Parts Avatar you can find ones that fit your budget and needs. Order easily from your home and receive your order at your doorstep.

It is helpful to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0A79 here:

Common Symptoms

• High voltage system may not be operative
• Service engine soon warning light will be on

Here are some ways which can help you to correct the OBD Code P0A79

• Repair or replace the damaged wiring, connectors, harnesses and circuits
• Repair or replace High Voltage battery
• Repair or replace the ECU
• Repair or replace the diagnostic tools that aren’t working properly

There is no need for panic as Parts Avatar - Car Parts Online is here to help you out! We have high grade Inverter With Converter Assembly, Inverter With Converter Assembly Harness, Engine Control Unit ECU, Motor Inverter Current Sensor and a lot more for our precious customers.

You can diagnose P0A78 quite easily as this is a generic OBD-II code. However it’s important to follow the steps and not sip any of them. If at all you think you won’t be able to do it on your own and need professional help, then feel free to approach a professional vehicle diagnostician for it and resolve your issue properly. However, to solve it you can follow the steps below:

Begin by getting hold of your OBD scanner and connect it to the diagnostic port of your vehicle. Make sure you retrieve all the codes and freeze fame the data also, remember to make note of them all in the order of appearance. If you are able to find any codes set prior to P0A79, then you will have to resolve them first. Previous codes can cause other error codes to set as well, so it’s important that they are taken care of first. After making note of all the codes, clear them and take your vehicle on a test drive to see if the code resets or if the PCM enters readiness more. If the latter happens, then you are having an intermittent condition, this condition may have to worsen before accurate diagnosis can be made. If the code is reset, then you will have to start your diagnosis, the first step is to check all of the electrical system connected with this issue.

Be thorough and patient in checking all the wires, circuits, connectors, harnesses etc. for damages like burning, breaks, corrosion, short etc. If you are able to find any of these issues, simply repair and correct them or opt for replacement. After you have sorted the circuitry you will have to clear the codes and again go on a test drive. Wait to see if the code returns or not (PCM enters readiness mode).If you find that the code is reset, then you will have to check all the parts pertaining to this problem. For this you will require your specific vehicles Technical Service Bulletins or TSB. Match them to the year of manufacture, make, model and engine. Once you have found it, match the symptoms and the error code P0A78 and see what diagnostic steps are mentioned in the TSB. Apart from having diagnostic steps the TSB will also have details of the parts and components related to this error. All the manufacturer specified configurations will also be present. Use the directions given by the TSB to fix your problem, the connector pinout charts, and circuit flow charts etc will be extremely helpful and enable you to avoid any issues with diagnosis.

Common Mistakes When Diagnosing the P0A79 Code

• Skipping steps in the Diagnostic procedure or not following them correctly
• Wrongly Concluding an issue with the ECU when the wires may be damaged and require repairs/replacements

P0A78 - Drive Motor "A" Inverter Performance