Slightly worn fuel cap seal. Hairline crack in EVAP hose. Minor purge valve seepage. Fuel tank seal deterioration. Filler neck corrosion.

Which cars are affected by P0456?

P0456 is most commonly reported on BMW, Ford, Toyota, Hyundai, Kia vehicles, but can appear on any make.

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P0456

Low severity

EVAP System Very Small Leak Detected

An extremely small leak has been detected in the EVAP system. These are often the hardest to find and may be intermittent, especially in cold weather when seals contract.

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Common causes of P0456

1Slightly worn fuel cap seal

2Hairline crack in EVAP hose

3Minor purge valve seepage

+2 more causes

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Commonly affected vehicles

BMWFordToyotaHyundaiKia

P0456 can appear on any vehicle — these are the makes where it is most frequently reported.

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Related fault codes

P0171Medium

System Too Lean (Bank 1)

P0300High

Random/Multiple Cylinder Misfire Detected

P0420Medium

Catalyst System Efficiency Below Threshold (Bank 1)

P0172Medium

System Too Rich (Bank 1)