What does it mean when the EPC light on the car dashboard is on?

[Polly]

The EPC indicator light can illuminate in two scenarios: during the power-on self-test and under other circumstances. The power-on self-test is an indication that the vehicle is checking the status of all sensors before driving. Typically, if the engine is not started after power-on, the light will turn off by itself after about 3 seconds. If the EPC light remains on after the vehicle starts or illuminates under other conditions, the common causes include faults in the engine intake system, throttle body issues, fuel system problems, engine malfunctions, ECU control unit failures, or brake light faults. Below is a detailed explanation of the reasons for the EPC light illuminating under other circumstances: Engine intake system fault: The EPC light will activate if the engine intake is obstructed or insufficient. Throttle body fault: Carbon buildup is a common issue with the throttle body. Additionally, dirt accumulation can affect intake, triggering the indicator light. Fuel system fault: This includes situations like substandard fuel, fuel deterioration, or poor fuel atomization. Engine fault: Insufficient engine pressure or problems with components like the intake valve in the powertrain can also cause the EPC light to illuminate. ECU control unit fault: Examples include interference with the vehicle's computer signals or false alarms from the computer. Brake light fault: This covers cases where the brake lights fail to illuminate, brake switch malfunctions, or brake circuit issues. Solutions for when the EPC light is on: Troubleshoot the intake system, use fuel with the appropriate octane rating, clean the throttle body, etc. Remove carbon deposits from relevant parts. Re-flash the ECU with updated data. If the EPC light comes on, the owner can first try turning off the engine and restarting it to see if the light remains off. If it does not come back on, there may be no issue, and the EPC light might have been affected temporarily. If the EPC light stays on or frequently illuminates, the vehicle should be taken to the nearest service center for professional diagnosis and repair to eliminate potential safety hazards. The full English name of EPC is Electronic-Power-Control, which translates to electronic power control. Most people refer to it as the engine electronic stability system. The EPC system primarily includes controllers and sensors related to the powertrain. When sensor data in the system is abnormal, the EPC system will take predefined actions on the powertrain. Common EPC indicator lights are usually displayed in two colors: yellow and red. If the EPC fault light is yellow and the car can still operate normally, drive slowly to a repair point for inspection. If the EPC fault light is red, it indicates a more serious issue. The driver should pull over immediately and contact a repair technician. Continuing to drive could severely damage the vehicle's core components or compromise safety.