P0457Low urgency
EVAP System Leak Detected (Fuel Cap Loose/Off)
Emission · EVAP System
✅ Check your fuel cap immediately. If loose or missing, tighten or replace it. The code clears on its own within a few drive cycles.
What this means
The EVAP system has detected a large leak consistent with a missing or loose fuel cap. This code is more specific than P0455 — it points directly at the fuel cap area.
Likely causes
- Loose fuel capMost common
- Damaged fuel cap sealMost common
- Wrong fuel cap installedCommon
Estimated repair cost
Gas cap replacement$10 – $25
Fuel filler neck inspection$50 – $150
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Frequently asked questions about P0457
What does P0457 mean?
The EVAP system has detected a large leak consistent with a missing or loose fuel cap. This code is more specific than P0455 — it points directly at the fuel cap area.
Is P0457 serious?
Check your fuel cap immediately. If loose or missing, tighten or replace it. The code clears on its own within a few drive cycles.
How much does it cost to fix P0457?
Repair costs for P0457 range from $10 – $25 depending on the root cause and your vehicle.
Can I drive with P0457?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.