What does the EPC light mean in Volkswagen?

1 Answers
StEloise
07/29/25 8:19pm
Volkswagen EPC stands for Electronic Power Control system, also known as the electronic throttle. Its working principle is that the engine control unit calculates the optimal target throttle opening based on position data feedback from the pedal sensor, then sends a signal to the throttle drive motor to rotate the throttle to the correct angle. Here is additional information: Reasons for the EPC light to illuminate: In 95% of cases, it's because the throttle is dirty and needs cleaning. However, in some cases, it could be due to brake lights not working, requiring inspection of the brake switch and wiring. In rare instances, it may illuminate due to fuel quality issues, which would be the result of personal fueling mistakes (except in cases of regional fuel quality problems). Troubleshooting methods: Check and fix intake system faults, use fuel that meets standards, clean the throttle body, etc.; Remove carbon deposits from relevant parts; Reprogram ECU data (if other faults are ruled out). If the issue persists, you may need to visit a 4S shop for professional repair.
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