OBD code P0455

The EVAP system has detected a large fuel-vapor leak, often related to the fuel cap or a disconnected hose.

Estimated severity

Medium

Common symptoms

Check engine light on
Strong fuel smell around the vehicle in some cases

Likely causes

Loose, damaged or missing fuel cap
Disconnected or broken EVAP hose
Cracked charcoal canister
Leaking fuel tank connections

Recommended checks

1. Check the fuel cap: present, in good condition and properly tightened.
2. Visually inspect larger EVAP hoses and fuel tank connections.
3. Inspect the charcoal canister and purge valve connections.
4. If nothing obvious is visible, use a smoke machine to locate the leak.

What does code P0455 mean?

Code P0455 indicates a large leak in the EVAP system. It is often caused by a loose or missing fuel cap, but it can also be a disconnected hose or broken EVAP component. It usually does not affect engine performance, but it does affect emissions and may cause a strong fuel smell.

Try assisted diagnostics