P0456Low urgency
EVAP System Small Leak Detected
Emission · EVAP System
✅ Safe to drive — check gas cap first.
What this means
A very small EVAP system leak. Often caused by a loose or worn gas cap. If cap is fine, an EVAP smoke test will locate the leak.
Likely causes
- Faulty gas capMost common
- Small crack in EVAP hoseCommon
- Loose fuel filler neckLess common
Estimated repair cost
Gas cap replacement$10 – $30
EVAP smoke test + repair$100 – $300
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Frequently asked questions
What does P0456 mean?
A very small EVAP system leak. Often caused by a loose or worn gas cap. If cap is fine, an EVAP smoke test will locate the leak.
Is P0456 serious?
Safe to drive — check gas cap first.
How much does it cost to fix P0456?
Repair costs for P0456 range from $10 – $30 depending on the root cause and your vehicle.
Can I drive with P0456?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.