What is the issue when the EPC light is on in a Jetta?
2 Answers
The issues when the EPC light is on in a Jetta are: 1. Brake light not working; 2. Throttle or wiring fault; 3. Brake switch damage; 4. Clutch switch damage; 5. Abnormal cylinder pressure or poor working condition; 6. Intake system leakage or blockage; 7. ECU fault; 8. Occasional false alarm. Taking the 2020 Jetta VS7 as an example, its body dimensions are: length 4624mm, width 1841mm, height 1644mm, wheelbase 2730mm, and fuel tank capacity 51L. The 2020 Jetta VS7 is equipped with a 1.4T turbocharged engine, with a maximum power of 110kW and a maximum torque of 250Nm, matched with a 5-speed manual transmission.
Last time when I was driving my Jetta, the EPC light came on and really freaked me out. Turns out it was an issue with the electronic throttle system. Most of the time, it's either because the throttle body is jammed due to excessive carbon buildup or the throttle position sensor is faulty. In my case, I suddenly couldn't accelerate while driving, and after inspection, it was just a loose sensor connector - plugging it back in fixed the problem. If the light stays on and you notice weak power or even engine stalling, you should immediately find a place to plug in a diagnostic tool to read the trouble codes. Never force the car to keep running, as it might damage the engine. By the way, for Volkswagen cars like this, don't clean the throttle body too frequently - the position sensor is particularly sensitive, and improper cleaning without subsequent matching can actually trigger the warning light. This issue is quite common in Jettas, and a specialized repair shop can usually fix it within half an hour.
