DTC P0451: Fuel Tank Pressure Sensor, Performance Problem: Condition

PCM detects to little or to much fuel tank pressure difference when operating evaporative leak monitor function or closing purge solenoid valve. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• Canister Drain Cut Valve (CDCV) malfunction.
• Charcoal canister clogging
• Fuel Tank Pressure (FTP) sensor malfunction.
• Plugged charcoal canister malfunction.
• Poor connection at CDCV, FTP sensor or PCM.
• Purge solenoid valve malfunction.
• Short in wiring at CDCV.