The EPC indicator light can illuminate in two states: 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. Generally, if the vehicle is not started after powering on, the light will turn off by itself after about 3 seconds. If the EPC light remains on after the vehicle is started or illuminates under other circumstances, the common causes include faults in the engine intake system, throttle valve, fuel system, engine, ECU control unit, or brake lights. The following are detailed explanations of the reasons for the EPC light illuminating under other circumstances: Engine intake system fault: The EPC light will illuminate if the engine intake is obstructed or insufficient. Throttle valve fault: Carbon buildup is a common issue with the throttle valve. Additionally, dirt on the valve body can affect intake and trigger the light. Fuel system fault: Issues such as substandard fuel, fuel deterioration, or poor fuel atomization can cause the light to illuminate. Engine fault: Insufficient engine pressure or problems with the intake valves or other power system components can also trigger the EPC light. ECU control unit fault: For example, interference with the vehicle computer signals or false alarms from the computer. Brake light fault: If the brake lights fail, 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 valve, etc. Remove carbon deposits from relevant parts. Re-flash the ECU 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 could have been triggered by a temporary influence. If the 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 mainly includes controllers and sensors related to the power system. When sensor data in the system is abnormal, the EPC system will take predefined actions on the power system. Common EPC indicator lights are usually displayed in two colors: yellow and red. If the EPC light is yellow and the car can still be driven, proceed slowly to a repair point for inspection. If the EPC light is red, the situation is more serious, and the driver should pull over immediately and contact a repair technician. Continuing to drive could directly damage the vehicle's core components or compromise safety.
