P0456Severity: Low
P0456 – EVAP System Very Small Leak
There is a very small leak in the EVAP system.
What it means
A very small leak (e.g. 0.5 mm) is detected in the vapor system. It is often the fuel cap seal or a thin hose issue.
Symptoms
- Check-engine light
- No other obvious symptoms
Common causes
- Fuel cap seal
- Thin hose/crack
- Vent/purge valve leak
- Canister seal issue
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Frequently asked questions
What does trouble code P0456 mean?
P0456 – EVAP System Very Small Leak. A very small leak (e.g. 0.5 mm) is detected in the vapor system. It is often the fuel cap seal or a thin hose issue.
Can I drive with a P0456 code?
It's usually not urgent, but finding and fixing the cause matters for emissions and fuel economy.