What does the EPC light on the car dashboard mean?

[Willow]

The main reasons for the EPC indicator light staying on include faults in the engine intake system, throttle valve issues, fuel system malfunctions, engine problems, ECU control unit failures, and brake light faults. The EPC indicator light may illuminate during power-on self-check or under other circumstances. The primary reasons are: The power-on self-check is an indication that the vehicle monitors the status of all sensors before driving. Generally, if the engine is not started, the light will turn off by itself after about 3 seconds. In other cases, the EPC light may stay on, or it may not turn off for a long time after the vehicle is started. Below are detailed explanations of other reasons that may cause the EPC light to illuminate and their solutions: Engine intake system fault: When the engine intake is obstructed or insufficient, the EPC light will activate. You can open the intake manifold switch valve cover, place a listening rod against the intake manifold switch valve, and repeatedly press the accelerator pedal while starting the engine to clear the blockage. Throttle valve fault: Carbon buildup is a common issue with the throttle valve. Additionally, dirt accumulation can affect intake, causing the indicator light to turn on. You can remove the throttle position sensor and install a new one on the throttle valve. Fuel system fault: Issues such as substandard fuel, fuel deterioration, or poor fuel atomization may occur. Choose the appropriate fuel grade for your vehicle. Engine fault: Insufficient engine pressure or problems with the intake valve and other power system components can trigger the EPC light. Clean carbon deposits from the affected areas. Anti-theft system fault: If the anti-theft controller is incompatible with the engine electronic controller, the anti-theft system may prevent the engine from functioning properly, and the engine fault light may also illuminate. ECU control unit fault: For example, if the vehicle computer signal is interfered with or the computer gives a false alarm, you may need to reprogram the ECU data. Brake light fault: If the brake light fails to illuminate, the brake switch malfunctions, or the brake circuit has issues, visit a repair shop or 4S store to replace the brake light. If the EPC light turns on, the owner can first try turning off the engine and restarting it to see if the EPC light remains on. If it does not, there may be no issue, as the EPC indicator could have been affected temporarily. If the EPC light stays on or frequently illuminates, drive to the nearest repair facility for professional diagnosis and timely resolution of 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 power system. When sensor data in the system is abnormal, the EPC system will take predefined measures to address the power system issues. Common EPC indicator lights typically display two colors: yellow and red. If the EPC fault light is yellow and the vehicle 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. Pull over immediately and contact a repair technician for assistance. Continuing to drive may directly affect the vehicle's core components or driving safety.

[River]

I've been driving all my life and have encountered the EPC light coming on several times, which is basically a warning signal for faults in the car's electronic throttle system. EPC stands for Electronic Power Control, indicating there's an issue with the computer managing the throttle opening and closing. There are many possible causes, such as a dirty throttle body getting stuck and affecting air intake, or a faulty throttle position sensor sending incorrect data to the engine. Other issues include short circuits in the wiring or blown fuses. If not addressed promptly, the car can lose power, have difficulty accelerating, and sometimes even stall, which is particularly dangerous on highways. I recommend regular maintenance, cleaning the throttle body every 5,000 kilometers. You can use a cleaner to do it yourself, but for actual repairs, it's better to go to a professional shop because the electrical circuits are complex, and DIY attempts can easily cause more damage.