DTC P0455: EVAP Control System Leak Detected, Blockage Or Large Leak: Condition

DTC is set when PCM detects high pressure (no vacuum) in fuel tank, measured immediately after Canister Drain Cut Valve (CDCV) has been closed. This is monitored when following conditions are met:

• Fuel tank pressure is -1.16 in. Hg.
• Fuel remaining is 35-85 percent of total capacity.
• Intake air temperature is 14-140°F (-10-60°C).
• Engine coolant temperature is 14-95°F (-10-35°C) when engine is first started.
• Atmospheric pressure is more than 20.5 in. Hg.
• Vehicle speed is 24.5-74.7 MPH.
• Engine speed is 1000-4000 RPM.
• Calculated load is 9-65 percent.
• Throttle opening angle is 3.1-12.5 percent.

This is an intermittent monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• CDCV malfunction.
• Catch tank malfunction.
• Charcoal canister malfunction.
• Check valve malfunction.
• Cracked fuel tank.
• Evaporative hoses damaged or loose.
• Fuel Tank Pressure (FTP) sensor malfunction.
• Loose, missing or defective fuel filler cap.
• Poorly installed fuel tank components.
• Purge solenoid valve malfunction.
• Rollover valve malfunction.