the code reading is p0455?

Hello,
The code:
P0455 - Evaporative Emission (EVAP) System Large Leak

The code for the large/gross leak usually means that the fuel tank is unable to hold any pressure at all.
It can be from a faulty vent valve that is stuck open. Faulty pressure sensor or a damaged or broken pipe/hose of the EVAP system.

When you take off the cap for refueling, if you have hear the air rushing out of the tank then it is likely a pressure sensor that is faulty and needs replacement.
But then again that is not a fail proof test as many times the gas cap does not make much noise.

The fuel tank pressure sensor is located on the top of the fuel pump sending unit.

Also if you have the canister vent valve stuck open it will let all the fumes escape the fuel tank and trigger that light as well.


https://www.2carpros.com/articles/evap-system-code-repair

I have attached the diagnostics for that code as well as EVAP components for your reference.

Please let me know of any questions.
Thank you.