DTC P0455: EVAP System Excessive Leak Detected: Condition

DTC is set when PCM detects high pressure (no vacuum) in fuel tank measured immediately after purge control is stopped with Canister Drain Cut Valve (CDCV) closed. Possible causes are:

• Purge solenoid valve malfunction.
• CDCV malfunction.
• Loose or missing fuel filler cap.
• Charcoal canister malfunction.
• Rollover valve malfunction.
• Cracked fuel tank or leaking fittings.
• Clogs or leakage in system hoses.
• Fuel tank pressure sensor malfunction.