DTC P0451: Fuel Tank Pressure Sensor Malfunction: Condition

PCM monitors fuel tank pressure during evap leak monitor and when purge solenoid valve is closed. DTC is set when fuel tank pressure difference is too large or small during these conditions. Possible causes are:

• Fuel tank pressure sensor malfunction.
• Purge solenoid valve malfunction.
• Open or short circuit.
• Charcoal canister clogged.