P0A93 Code: Inverter “A” Cooling System Performance

Diagnostic trouble codes (DTCs) can be challenging to figure out. If your vehicle is having problems and your OBD-II scanner shows a P0A93 code, you have to follow vehicle-specific diagnostic procedures to identify the possible causes of your DTC. In this article, you’ll learn about the P0A93 code, its common symptoms, possible causes, and recommended fixes.

What Does the P0A93 Code Mean?

Code P0A93 stands for “Inverter ‘A’ Cooling System Performance.” It’s a hybrid trouble code that applies to most hybrid vehicles with OBD-II, which includes vehicles manufactured after 1996.

A P0A93 code might mean that your powertrain control module (PCM) has detected a problem with your vehicle’s cooling system. In general, hybrid vehicles utilize a separate inverter cooling system to maintain proper operating temperatures. Any issue with the cooling system might trigger your high voltage control module to send a message to the PCM to store the code.

Dedicated Inverters in Hybrids and Electric Vehicles

Hybrids and electric vehicles (EV) use high voltage batteries that output DC current, but the motors that drive the wheels on these vehicles operate on AC current. Since DC has to be converted to AC for these motors to work, every electric motor on these platforms has its own dedicated inverter.

The inverter requires very heavy electronics, to include IGBT transistors, and in doing the required work, these components generate a lot of heat that must be carried away by air or coolant.

Note: The definition of code P0A93 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0A93 Code?

There are some issues that can trigger a P0A93 code. Make sure to thoroughly inspect your cooling system components for signs of wear and tear to get an accurate diagnosis. Here are some of the possible causes of the P0A93 code:

• Coolant system leak in the hybrid cooling system
• High voltage coolant pump failure

What are the Common Symptoms of the P0A93 Code?

The P0A93 code might share some symptoms with other hybrid trouble codes. However, if your PCM is only storing this particular code, you might observe these common symptoms.

• Illuminated check engine light
• High voltage system may overheat

How to Diagnose the P0A93 Code

A P0A93 code can lead to other cooling system issues if it’s not resolved. The following video can guide you through the general diagnostic procedures for troubleshooting a P0A493 code. However, we recommend doing additional research on your specific vehicle before attempting any repairs.

How to Fix the P0A93 Code

There’s no one way to troubleshoot a P0A93 code because certain vehicles require specific diagnostic and repair instructions. What may work to fix a P0A493 code in a Prius may not work for a Lexus. You’ll have to find out the underlying cause (or causes) of your DTC to figure out the right fix.

If you have an OBD-II scanner and the necessary repair skills, you can probably troubleshoot a P0A93 code yourself. Make sure to consult your vehicle’s repair manual to avoid making mistakes during this process.

There are plenty of credible OBD-II resources available online. ALLDATA’s single-vehicle subscription is a great example. It contains all the information you need to troubleshoot your particular DTC. You can also look up service bulletins for your vehicle.

However, if you don’t feel confident in your DIY skills, you can hire a certified mechanic to check your vehicle. They can perform the necessary tests and repairs on your vehicle, so you don’t have to.