What causes the EPC light to come on while driving?
2 Answers
Here are the main reasons why the EPC light comes on while driving: 1. Dirty throttle body: It should be cleaned. 2. Brake light not working: The brake switch and wiring need to be checked. Here is more information about EPC: 1. EPC stands for Electronic Power Control, which assists in engine power control and involves many components, including the engine control unit, electronic throttle body, throttle pedal position, brake switch, clutch switch, power assist switch, generator load, wiring, etc. 2. If any of these components fail and cause the engine control unit to inaccurately control power, the EPC warning light will activate.
The EPC light came on while driving. As an experienced mechanic, I've seen many such cases, usually related to the electronic throttle system. The most likely issue is a stuck or excessively dirty throttle body causing poor computer control. Faulty signals from the accelerator pedal position sensor are also common, often caused by aged, loose, or corroded wiring harness connectors. Low battery voltage or alternator failure can lead to unstable power supply, triggering the warning. On the software side, the engine control unit may need updating or resetting. After the light comes on, the car's response may slow down or even limit speed, affecting acceleration performance. Don't underestimate this - it poses significant safety risks. I recommend immediately finding a safe place to stop and check simple components like fuses and connectors, then head straight to a professional repair shop to read the fault codes for an accurate solution. Don't forget regular maintenance like throttle body cleaning and wiring harness inspections.
