Guide To P0A74 OBD Error Code Solutions

<<See All OBD Codes

The check engine light is illuminating and the P0A74 code is set, you don’t know what that means and how to resolve it. Well, don’t worry, you have landed at the right page, you can know all about the code, what it means and why it was set as well as how to sort it out. So continue to read. The OBD-II code P0A74 is defined as a Generator Phase V Current High. It is set by the High Voltage Control Module of your vehicle which is the Engine Control Unit, when it detects a failure of current monitoring sensors.

The inverter of your vehicle is responsible to convert the high-voltage direct current as well as the alternating current for MG1/MG2. This inverter has a three-phase bridge circuit, which contains 6 power transistors for each MG1 and MG2. These are present to enable conversion of the direct current and the alternating current (three-phase). The ECU also controls the actuation of the power transistors as well as the HV.Information is transmitted by the inverter about all necessary things that affect control to the ECU. These include amperage and voltage, when this transmitted information is received by the ECU and a malfunction is detected the P0A74 code is set, and the check engine light is turned on.

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

• Issues with the Inverter with Converter Assembly
• The Inverter with Converter Assembly harness is damaged due to open or short
• The circuit of the Inverter with Converter Assembly shows poor electrical connection

1. Inverter with Converter Assembly - Check for repairs and fix them to see If the P0A74 code is resolved, otherwise you will have to replace the inverter with converter assembly.
2. Inverter with Converter Assembly Harness - Try to repair otherwise replace the harness if the repairs don’t solve the P0A74 code.
3. Engine Control Unit - Try to repair your ECU 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. We ship in just a matter of days!
4. Inverter Current Sensors - Check if you can repairs and fix the sensors otherwise go for replacement to get rid of P0A74 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.
7. Engine Control Module - In case you have to replace the ECM don’t worry you can find 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!

Here are some common symptoms listed for you, so that can you can easily recognise what issue your vehicle is having.

Common Symptoms

• High voltage system may not work as regular
• The check engine Light is on since the code was set

Here are the ways by which you can correct the P0A74 error

• Repair or replace all the faulty wiring, cables, circuits and harnesses
• Repair or replace faulty diagnostic tools
• Repair or replace malfunctioning ECU

At Parts Avatar we stock the best in range auto parts at the budget friendly prices. You can shop online for Inverter with Converter Assembly, Inverter with Converter Assembly Harness, Engine Control Unit, Inverter Current Sensors you can simply rely on us for quality auto parts. etc.

To start your diagnosis first get hold of 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 P0A74, then you will have to resolve them first. 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 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 P0A74 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 P0A74 Code

• Diagnosis procedure is not followed step-by-step
• Hurriedly assuming an issue with the ECU when the wires may be damaged and require repairs/replacements