The EPC indicator light can illuminate in two states: during power-on self-test and under other circumstances. The power-on self-test is an indication that the vehicle is monitoring the status of all sensors before driving. Generally, if the vehicle is not started after power-on, the light will turn off by itself after about 3 seconds. If the EPC light remains on under other circumstances or does not turn off for a long time after the vehicle is started, the possible causes include faults in the engine intake system, throttle, fuel system, engine, ECU control unit, or brake lights. Below is a detailed explanation of the reasons for the EPC light illuminating under other circumstances: Engine intake system fault: The EPC light will alert when the engine intake is obstructed or insufficient. Throttle fault: Carbon buildup is a common issue with the throttle. Additionally, dirt on the throttle body can affect intake, causing the light to illuminate. Fuel system fault: This includes situations such as substandard fuel, fuel deterioration, or poor fuel atomization. Engine fault: Insufficient engine pressure or issues with the intake valve or other powertrain components can also trigger the EPC light. ECU control unit fault: For example, interference with the vehicle computer signals or false alarms from the vehicle computer. Brake light fault: This includes situations where the brake lights do not illuminate, the brake switch malfunctions, or there are issues with the brake wiring. Solutions for when the EPC light illuminates: Troubleshoot the intake system, use fuel with the appropriate octane rating, clean the throttle, etc. Remove carbon deposits from relevant parts. Re-flash the ECU with relevant data. If the EPC light illuminates, the owner can first try turning off the engine and restarting it to see if the light remains on. If it does not, there may be no issue, and the light may have been affected temporarily. If the EPC light remains 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 mainly includes controllers and sensors related to the powertrain. When sensor data in the system is abnormal, the EPC system will take predefined measures for the powertrain. Common EPC indicator lights are usually displayed in two colors: yellow and red. A yellow EPC fault light indicates that the vehicle can still be driven, but it should proceed slowly to a repair point for inspection. A red EPC fault light indicates a more serious issue, and the vehicle should be pulled over immediately, with professional repair services contacted. Continuing to drive under these conditions may directly affect the vehicle's core components or driving safety.
