Check Hybrid System Error and its solution

What does the “Check Hybrid System” warning mean?

The “Check Hybrid System” warning light is a potential indication of a fault or error within the hybrid system of Toyota Aqua, Prius, Camry, Vezel, or Lexus hybrid vehicles. Upon encountering this warning, it is advisable to promptly seek professional assistance for diagnostic evaluation.

The warning light is delineated in either yellow or red. The former typically denotes a minor error, while the latter signals a critical issue that may necessitate refraining from driving, if feasible.

The presence of the “Check Hybrid System” warning may coincide with symptoms such as:
Reduced speed and acceleration.
Hybrid system not working and the car running solely on petrol.
Decreased fuel economy.
Car going into limp mode.

Causes of “Check Hybrid System” dashboard warning:
There are multiple issues that can trigger this warning. Using a diagnostic tool can help you identify the cause.

Inverter problems: The inverter converts DC energy into AC energy and needs to be kept cool to function properly. If it’s not working correctly, your car’s hybrid system may not operate at full capacity. This problem can be related to overheating, caused by low inverter coolant or a malfunctioning cooling system.

Blown fuse: The hybrid battery is connected to a fuse. If this fuse fails, the battery will stop working. Fortunately, replacing the fuse is usually a simple task.

Malfunctioning battery cell(s): If you notice a warning light and the hybrid battery’s state of charge fluctuating rapidly from empty to full, your battery pack may have a malfunctioning cell in one of its modules.

Replacement of 12V battery: Sometimes, issues with your car’s 12-volt battery can trigger hybrid-related warnings. This is often accompanied by problems with the car’s electrical accessories (lights, radio) or starting issues.

Common hybrid fault codes and what they mean:
When you plug a diagnostic device into your car’s OBD2 port, it may display one or more of the following fault code. Here is an explanation of what each one means.

Hey there! Just a heads up on some important info:

P0A80: This code means that there’s an issue with the hybrid battery pack. It could be due to a failed battery cell, a damaged battery module, or a problem with the battery management system.

P0A7F: This code points to a problem with the battery pack’s state of charge (SOC) sensor. This sensor measures the amount of charge in the battery pack and sends this information to the vehicle’s computer. If it’s not working properly, it can make the hybrid system operate inefficiently.

P0A92: This code indicates a problem with the DC-DC converter, which converts high voltage DC power from the hybrid battery pack to lower voltage DC power for use by the vehicle’s electronics. If it’s faulty, it can cause the hybrid system to operate poorly or not at all.

P0AA6: This code means there’s a problem with the electric motor temperature sensor. This sensor measures the temperature of the electric motor and sends this information to the vehicle’s computer. If it’s not working right, it can make the hybrid system operate inefficiently.

P0AC4: This code indicates a problem with the hybrid powertrain control module (PCM), which controls the operation of the hybrid system. If it’s faulty, it can cause the hybrid system to operate poorly or not at all.