Check Engine Light and EPC Light (VW/Audi): Meaning
Key Takeaway
EPC and check engine on your VW or Audi? Here's what it means.
What Is the EPC Light?
EPC means Electronic Power Control. It's exclusive to VW Group vehicles (VW, Audi, Skoda, SEAT) and indicates a throttle control system fault.
EPC + Check Engine Together
| Cause | Codes | Severity |
|---|---|---|
| Throttle body failure | P0121, P2015 | High |
| Brake light switch | VW-specific (no OBD) | Medium |
| Accelerator pedal sensor | P2122, P2127 | High |
| Mass airflow sensor | P0101 | Medium |
| Intake manifold flap | P2015 | Medium |
What to Do
1. Check brake lights first — a failed switch is a common cheap fix.
2. Scan with a VW-compatible tool.
3. Avoid heavy acceleration until diagnosed.
ProHow Steer Helps
Steer reads VW/Audi-specific codes beyond basic OBD-II, including EPC-related faults.
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