Symptoms
- 'EPC' text or icon lit on the dash
- Possible reduced power, rough idle, or hesitation
- Sometimes paired with the check engine light
Likely causes
- CommonFaulty throttle body or throttle position sensorThe throttle body controls airflow into the engine and wears over time.
- CommonBrake light switch faultOddly, a failed brake light switch can trigger the EPC light on many VW/Audi models.
- PossibleAccelerator pedal sensor issueThe pedal sends an electronic signal rather than a mechanical cable in modern cars.
- PossibleClutch pedal switch fault (manual transmissions)Some models require this switch to work correctly for the throttle system.
- Less commonWiring or connector issue in the engine bayCommon after other engine work if a connector was left loose.
What to do
- Check if brake lights work normally when pressing the pedal, since a bad switch is a common trigger.
- Note if the car feels underpowered, hesitant, or idles roughly.
- Turn the car off and back on to see if the light clears temporarily.
- Avoid hard acceleration or highway merging if power feels reduced.
- Have the code read at a shop, since EPC-related codes point to a specific sensor or switch.
- Replace or repair the flagged component, commonly the brake light switch or throttle body.
- Clear the code after the repair and confirm the light stays off during a test drive.
Tools and parts
Brake light switchSearch: “brake light switch for your VW/Audi model”
Throttle bodySearch: “throttle body for your car make and model”
When to call a pro
See a mechanic to scan the specific EPC-related code, since several different components can be the cause.
Safety
Use caution
If the car loses power unexpectedly, move to the shoulder carefully rather than continuing in traffic.