P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
What does P0457 mean?
P0457 — Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off). This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects evaporative emission control system leak detected (fuel cap loose/off). The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0457
- Fuel cap not tightened after fueling
- Damaged or missing fuel cap
- Incorrect aftermarket fuel cap
- Fuel cap seal worn or cracked
- Filler neck damage preventing a proper seal
How to fix P0457
- Tighten the fuel cap and clear the code
- Run a drive cycle to confirm the code does not return
- Inspect the fuel cap for damage and replace with an OE cap if worn
- Check the filler neck for damage
- Smoke test the filler area if the issue persists