OBD-II code guide
P0457 EVAP Leak Detected Fuel Cap Loose or Off
P0457 usually means the EVAP system detected a leak that may be related to the fuel cap area.
What it means
The system could not hold vapor pressure and the leak may be large enough to suggest a loose cap or cap seal issue.
Common symptoms
- Check engine light after fueling
- Fuel smell near cap
- Usually normal driving
- Emissions readiness issue
- Possible repeated EVAP codes
Likely causes
- Loose fuel cap
- Damaged cap seal
- Filler neck issue
- EVAP hose leak
- Vent or purge valve issue
First checks
- Tighten the cap if equipped.
- Inspect cap seal and filler neck.
- Do not top off after the pump clicks.
- Record related EVAP codes.