Error Code P0A72: What It Means & What To Do?

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The OBD codes are there to help you understand what may be going wrong with your vehicle, and also give you a direction on how to resolve them. If you have the P0A72 code flashing you it basically means that the high voltage control module has detected some failure of the current monitoring sensors of your vehicle. In such a case the ECU will set the P0A72 code and the check engine light will also be illuminated.

Here’s some more technical information about this OBD-II code, that will help you understand what exactly has happened. This code is also defined as a Generator Phase V Current. The inverter of the vehicle converts high-voltage direct current of the High Voltage battery as well as the alternating current for the MG1/MG2. This inverter has a three-phase bridge circuit. It consists of six power transistors each for MG1 and MG2, these help in convert the direct current and the three-phase alternating current. The ECU is the HV control, it’s job is to control the actuation of the power transistors. Information necessary for effecting control is transmitted by the inverter, which include amperage and voltage to the ECU. The inverter current sensors are monitored by the HV control ECU, this helps it detect any malfunction in the sensor system as soon as it may occur.

What causes this problem with the Generator Phase V Current?

• Issue with Inverter with Converter Assembly
• Open or shorted harness of the Inverter with Converter Assembly
• Poor electrical connection of the circuit of Inverter with Converter Assembly

1. Inverter with Converter Assembly - Closely look for repairs and fix them. If the P0A72 code is not resolved you will have to replace the inverter with converter assembly.
2. Inverter with Converter Assembly Harness - Replace the harness if the repairs don’t solve the P0A72 code.
3. Engine Control Unit - If there’s a repairable fault in the ECU then try to repair first , 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. And don’t worry we ship across Canada within days!
4. Inverter Current Sensors - Check if repairs can fix the sensors or go for replacement so that you can get rid of P0A72 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 - These are crucial during diagnosis. At Parts Avatar you can find ones that fit your budget and needs. Order Online easily from your home and receive your order at your doorstep.
7. Engine Control Module - In case you have to replace the ECM don’t worry we stock reliable brands and give warranty too. Search for the ECM compatible with your vehicle and place order, our customer care agent is available online 24/7 to help you out!

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P0A72 code by mentioning some major symptoms below:

Common Symptoms

• The high voltage system may be inoperative
• Check engine light is on

It is very important to fix the fault code P0A72. So here are some ways with which you can correct this issue: 

• Repair or replace the damaged wires and circuitry
• Repair or replace the ECU
• Repair or replace Inverter with Converter Assembly Harness 

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of Inverter with Converter Assembly, Inverter with Converter Assembly Harness, Engine Control Unit, Inverter Current Sensors and a lot more. We are sure that now all your issues would be resolved.

Get your OBD scanner and connect it to the diagnostic port of your vehicle, retrieve all the codes and freeze fame the data. Remember to make note of them all in the order of appearance. If you are able to find codes set prior to P0A72, then you will have to resolve them first. Sometimes previous codes can cause other error codes to set too, so it’s important that they are resolved 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. Thoroughly check 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 the PCM enters readiness mode.

If 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 P0A72 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 misdiagnosis.

If in case you’re unable to still resolve the problem or are feeling overwhelmed and need help, approach a professional vehicle diagnostician for it and resolve your issue properly.

Common Mistakes When Diagnosing the P0A72 Code

• Not following the diagnosis procedure step by step
• Wrongly assuming an issue with the ECU when the wires may be damaged and require repairs/replacements