Question about Hyundai Elantra

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Po455 trouble code, seems like all the hoses are good. Sometimes goes away for a week sometimes a few hours,any ideas?

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P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

This indicates 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.

Symptoms: You likely won't notice any drivability problems.

Causes: 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

Possible Solutions: With a p0455, the most common repair is to:
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 necessary


Test, check it and keep us updated.

Posted on May 25, 2011

  • Robert Drummond
    Robert Drummond Jan 23, 2014

    The information is great but without knowing where the hoses for the EVAP System run to and from it is kinda hard to do a visual inspection

  • Robert Drummond
    Robert Drummond Jan 23, 2014

    I dont even know what hoses to look at

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  • Contributor
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The code description is .... evap incorrect purge flow. It could be evap canister purge solenoid. It is common issue

Posted on May 25, 2011

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