P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
The EVAP test suggests the fuel cap is loose or missing.
Common causes
- Loose fuel cap
- Damaged cap seal
- Damaged filler neck
Symptoms
- Check engine light
- Cap warning on some cars
What to check
- Tighten or replace the fuel cap
- Inspect the filler neck
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0457, follow the service information for that make and model.