Possible Causes

Possible causes are:

• Aftermarket EVAP hardware (i.e. fuel filler cap) not meeting required specifications (P0455).
• Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube (P0455).
• EVAP canister purge valve stuck closed (P0455).
• Damaged or missing fuel filler cap (P0455).
• Insufficient fuel filler cap installation (P0455).
• Loose fuel vapor hose/tube connections to EVAP system components (P0455).
• Blockages or restrictions in fuel vapor hoses/tubes (P0455).
• Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked (P0455).
• Canister Vent (CV) solenoid stuck open (P0455).
• Mechanically inoperative FTP sensor (P0455).
• Pinched, blocked or plugged fuel vapor tubes/hoses except between fuel tank and EVAP canister (P1443).
• Damaged EVAP canister (P0455 or P1443).
• Disconnected, cracked or cut fuel vapor tubes/hoses except between fuel tank and EVAP canister (P1443).
• Damaged EVAP canister purge valve (P1443).