DTC P0455: EVAP System Malfunction, Excessive Leak Detected: Condition

DTC is set when PCM detects excessive difference in fuel tank pressure measured immediately after purge control is stopped with Canister Drain Cut Valve (CDCV) closed. Possible causes are:

• Purge solenoid malfunction.
• CDCV malfunction.
• Loose fuel filler cap.
• Charcoal canister malfunction.
• Rollover valve malfunction.
• Cracked fuel tank.
• MAP sensor malfunction.
• Intake Air Temperature (IAT) sensor malfunction.
• Throttle Position (TP) sensor malfunction.
• Mass Airflow (MAF) sensor malfunction.
• Vehicle Speed Sensor (VSS) malfunction.
• Fuel tank pressure sensor malfunction.
• Engine Coolant Temperature (ECT) sensor malfunction.
• Vent cut valve malfunction.
• Poor installed fuel tank components.
• Clogs or leakage in system hoses.
• Insufficient manifold absolute pressure.
• Fuel level sensor malfunction.
• Open or short in wiring harness.
• Fuel shut-off valve malfunction.
• Pressure control valve malfunction.