Hi,
That code indicates a large leak in the EVAP system. Code 455 can indicate the canister purge valve is stuck open. This could draw fumes from the EVAP leading to a richer fuel mixture.
Do me a favor. The solenoid is on the intake manifold. Confirm the connector is tight, the wiring is good, and let me know what you find.
I attached a pic below showing the location of the part.
Take care and let me know.
Joe
See pic below.
Image (Click to make bigger)
Tuesday, June 1st, 2021 AT 7:01 PM