P0455 - Evaporative Emission Control System Leak Detected (Large Leak)
Plain-English meaning
This code indicates that the vehicle's onboard diagnostic system has detected a large leak in the evaporative emission control (EVAP) system, which is designed to prevent fuel vapors from escaping into the atmosphere.
What to check first
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What not to replace yet
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Stop driving when
It is generally safe to continue driving, but if you notice strong fuel odors or fuel leaks, stop driving and seek professional assistance.
Related symptoms
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Owner steps
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Likely causes
Loose or missing gas cap (medium)
Damaged or cracked EVAP hoses or lines (medium)
Faulty or damaged charcoal canister (medium)
Leaking or damaged EVAP purge or vent valve (medium)
Faulty fuel tank or fuel tank gasket (medium)
Shop steps
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Follow-up questions
When was the gas cap last replaced or inspected?
Have there been any recent repairs involving the fuel system?
Is there any noticeable fuel odor or visible fuel leakage?
Has the vehicle failed an emissions test recently?