This is a fuel vapor leak or lack of purge flow in the EVAP control system.
It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system.
Fuel vapors are routed by hoses to a charcoal canister for storage.
Later when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
A code p0455 most likely means one or more of the following has happened:
- A loose or improperly affixed gas cap
- A non-conforming gas cap (i.e. not factory/original brand)
- Other leak or damaged piece in EVAP system
With a p0455, the most common issue to check :
- Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
- Otherwise, replace the gas cap, and/or
- Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if needed.
If the vacuum leak from the P0455 is big then this could cause you the P0300 which is a multiple engine misfire .
so i would take care of the P0455 code first . in some cases you may hear a vacuum suction hiss when running the engine at idle
so check where the purge valve is for leaks ..
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