What does the EPC light on in Q3 mean?

[MacRyan]

Here are the reasons why the EPC light is on in Q3: 1. A sign of a dirty throttle body. Remove and clean it, then rematch. If necessary, retrieve the fault code to troubleshoot the issue specifically. 2. Another reason is that the brake light is not working. Replace the bulb or check the brake switch and wiring. 3. There is also the issue of fuel quality. The EPC warning light may also illuminate. Main reasons why the car's EPC warning light comes on: 1. The EPC warning light staying on continuously indicates a fault in the engine management system or electronic control, often accompanied by unstable idling or engine cold start shaking. However, for domestic car owners, it is usually caused by the quality of domestic fuel and a dirty driving environment. Drive to a repair service station as soon as possible for inspection. In most cases, cleaning the throttle body can resolve the issue. 2. The EPC indicator light will illuminate when the ignition is turned on for a function check. If this indicator light comes on while driving, it indicates a fault in the engine power electronic control system. The engine must be checked immediately. Generally, a dirty throttle valve body, vacuum leaks in the intake system, a faulty brake switch, or an engine that has not been upgraded in time can all cause EPC faults.

[OGage]

I've been in the auto repair industry for nearly 20 years and have encountered many cases of EPC light illumination. This indicator light signifies a fault in the Electronic Power Control system, specifically meaning the electronic control modules of the engine or transmission have detected an abnormality. The most common issue is a dirty or sticking electronic throttle body, where carbon buildup causes inflexible valve operation. It could also be a faulty accelerator pedal sensor or poor contact in the brake light switch. Last year, I repaired a vehicle where the EPC light came on due to water ingress causing a short circuit in the wiring harness connector. If the light suddenly comes on while driving, you'll notice a significant power loss and the tachometer dropping instead of rising. Never push through this situation - immediately reduce speed and pull over, otherwise you risk damaging the catalytic converter. Some older vehicles may also experience hard starting or idle fluctuations. I recommend visiting a professional repair shop as soon as possible to diagnose trouble codes with specialized equipment, as delaying repairs will only increase costs.