DTC P1450: EVAP Control System Malfunction, Excessive Vacuum: Condition

DTC is set when Powertrain Control Module (PCM) detects fuel tank pressure is low for 10 seconds when intake air temperature is more than 14°F (-10°C), engine coolant temperature was less than 95°F (35°C) when engine was first started and now is 212°F (100°C), and vehicle speed is 61.9 MPH or less. This is a continuous monitor. MIL is illuminated when Powertrain Control Module (PCM) detects malfunction during 2 consecutive drive cycles. Possible causes are:

• Canister Drain Cut Valve (CDCV) malfunction.
• EVAP air filter plugged.
• Charcoal canister malfunction.
• Plugged EVAP hoses.
• Fuel Tank Pressure (FTP) sensor malfunction.
• Purge solenoid valve malfunction.