DTC P0451: EVAP System Pressure Sensor Performance: Condition

DTC is set when Engine Control Module (ECM) detects low voltage input from Fuel Tank Pressure (FTP) sensor after EVAP system leak check has been completed. This is a continuous monitor. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• Short or open circuit between FTP sensor and ECM.
• FTP sensor malfunction.
• EVAP canister air valve malfunction or plugged air valve passage.
• ECM malfunction.