What are the reasons for the EPC light being on and engine shaking in a Passat?

[Grayson]

The reason for the EPC light being on and engine shaking in a Passat may be a damaged throttle control unit. Below is relevant information about the EPC light: 1. Reasons for the EPC light being on: (1) It could be due to a dirty throttle body. In this case, simply cleaning the throttle body and then performing a reset can resolve the issue. (2) A damaged throttle control unit, damaged engine control wiring harness, faulty throttle pedal position sensor, leaking crankcase ventilation system, intake system leakage, faulty brake light switch, and burnt-out brake light bulbs can also cause the EPC light to illuminate. 2. Measures to prevent the EPC indicator light from coming on: The car should be serviced promptly after reaching a certain mileage to ensure optimal performance and to eliminate the possibility of the EPC indicator light coming on due to engine carbon buildup. The gasoline used in the car should be the recommended type for the vehicle. Using the appropriate gasoline plays a significant role in protecting the car's engine and throttle, effectively reducing engine carbon buildup and ensuring the car operates at maximum power.