P0A73 OBD Error Code: Problem & Solutions

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You just found out that there’s some issue with your car, and the P0A73 code is set. This OBD-II error code is also known as Generator Phase V Current Low. But don’t worry, it’s not something that can’t be resolved. Knowing more about the code and why it has been set, can help you sort this matter out or get the right help for it. This code is set by the High Voltage control module of your vehicle or the Engine Control Unit when it detects a failure in the current monitoring sensors. Still not sure what that means, then simply read more below.

The inverter of your vehicle converts high-voltage direct current coming from the HIgh Voltage battery as well as the alternating current for the MG1/MG2. This inverter consists of a three-phase bridge circuit. There are six power transistors present for each (MG1 and MG2), so that the direct current and the three-phase alternating current can be converted. The Engine Control Unit, which controls this high voltage also controls the actuation of the power transistors. This inverter transmits all the necessary information that affects control like amperage and voltage to the ECU. Any malfunction hence, picked up by the ECU results in setting P0A73 code.

What causes this problem with the Generator Phase V Current Low?

• Problematic Inverter with Converter Assembly
• Open or shorted Inverter with Converter Assembly harness
• Poor electrical connection in the Inverter with Converter Assembly circuit

1. Inverter with Converter Assembly - During diagnosis if you noticed that there are some repairs needed then fix them. If the P0A73 code is not resolved you will have to replace the inverter with converter assembly.
2. Inverter with Converter Assembly Harness - You will have to replace the harness if the repairs don’t solve the P0A73 code.
3. Engine Control Unit - If you can repair the ECU then try that first , if that’s not helping, you will have to opt for replacement. Order Online easily at Parts Avatar, select the ECU compatible with your vehicle and place your order. And don’t worry you won’t have to wait too long, we ship within days!
4. Inverter Current Sensors - Check if repairs can fix the issue or go for replacement so that you can get rid of P0A73 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, we ship across Canada 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 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 with warranty. Search for the ECM compatible with your vehicle and place order, our customer care agent is available online 24/7 to help you out!

If you are facing OBD error code P0A73, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• The High voltage system may not be working as usual
• The check engine Light is On

Once you are aware of the symptoms of your vehicle’s problem, it’s easier to detect and solve them. Here are some ways by which you can correct the P0A73 error.

• Repair or replace the faulty wiring
• Repair or replace malfunctioning ECU
• Repair or replace the inaccurate diagnostic tools

If you are having this problem, don’t worry about finding the right replacement parts. Parts Avatar has a wide range of best priced Inverter with Converter Assembly, Inverter with Converter Assembly Harness, Engine Control Unit, Inverter Current Sensors and more to help you out in fixing your car.

Now that you’re aware of the problem, you can follow these steps to diagnose the P0A73 error code. Start off by getting hold of your OBD scanner and connect it to the diagnostic port to retrieve all the codes and freeze fame the data. Make note of them all in the order of appearance. If you are able to find codes set prior to P0A73, then you will have to resolve them first. Sometimes previous codes can cause other error codes to set as well, 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 not (the PCM enters readiness mode). If the latter happens, then you are having an intermittent condition, this condition may have to worsen before accurate diagnosis can be made.

If you find that the code has reset, you will have to start your diagnosis right away. 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 pin out charts, and circuit flow charts etc will be extremely helpful and enable you to avoid any misdiagnoses.

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 P0A73 Code

• Not sticking to the diagnosis procedure step by step
• Assuming an issue with the ECU when the wires may be damaged and require repairs/replacements