Possible Causes
WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
ECM illuminates MIL and sets DTC P0455, when EVAP control system has a large leak or EVAP system does not operate properly. Possible causes are:
- Fuel filler cap remains open or fails to close.
- Incorrect fuel tank vacuum relief valve.
- Incorrect fuel filler cap.
- Foreign matter in fuel filler cap.
- Leak in hose between intake manifold and EVAP-CPVCSV.
- Foreign matter in EVAP-CVCV.
- Leak in EVAP canister or fuel tank.
- Leak or blockage in EVAP purge line.
- Leak or blockage in hose to EVAP Control System Pressure Sensor (EVAP-CSPS).
- Loose or disconnected hose.
- Defective EVAP-CVCV or circuit.
- Defective EVAP-CPVCSV or circuit.
- Defective fuel tank temperature sensor.
- Missing or damaged EVAP-CVCV "O" ring.
- Defective EVAP-CSPS.
- Defective refueling control valve.
- Leak in On-Board Refueling Vapor Recovery (ORVR) system.