Passat b5 dashboard shows epc. What does this mean?

1, EPC fault light is always on, indicating that the engine management system or electronic control is out of order, which is often accompanied by unstable idle speed of the vehicle or engine jitter during cold start. But for domestic car owners, it is generally caused by domestic oil quality and dirty environment inside the car. Drive to the maintenance service station as soon as possible for maintenance, and generally clean the throttle.

2. When the ignition switch is turned on for function check, the indicator EPC will light up. If the indicator lights up while driving, it indicates that the engine power electronic control system is out of order. The engine must be checked immediately. Under normal circumstances, dirty throttle body, vacuum leakage of intake system, broken brake switch and untimely engine upgrade may all lead to EPC failure.

3. When the 3.EPC light is on, it may be that the throttle is dirty and needs to be cleaned; Or the brake light doesn't work, replace the light bulb or check the brake switch and wiring. Also, due to the oil problem, the EPC fault light will also light up.

Extended data

In EPC system, the original throttle cable is cancelled, and the throttle opening is driven by DC motor. The electronic throttle is superior to the pull-wire acceleration control, because the electronic throttle knows the power demand of the engine by calculating and analyzing the input signal of the accelerator pedal position, and converts this information into the torque of the engine through various actuators. Due to safety, fuel consumption and other reasons.

The engine control unit detects the electronic throttle system to sense the occurrence of the fault, and displays it through a small yellow light installed in the instrument cluster.