OBD code P0456

An extremely small EVAP leak has been detected and can often be difficult to locate.

Estimated severity

Low

Common symptoms

Check engine light on with no other noticeable symptoms

Likely causes

Slightly damaged fuel cap seal
Tiny cracks in EVAP hoses
Purge valve not fully sealing under certain conditions

Recommended checks

1. Inspect the fuel cap and replace it if needed.
2. Carry out a careful inspection of EVAP hoses and connections.
3. Perform a leak test with workshop equipment such as smoke or pressure testing.

What does code P0456 mean?

P0456 indicates a very small EVAP system leak. It is similar to P0442 but even more subtle. In many cases, it can only be found with advanced diagnostic equipment or a smoke machine. It does not affect drivability, but it keeps the check engine light on.

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