Error Code P0455
Moderate Issue
DTC Code P0455 indicates a gross leak in the Evaporative Emission Control (EVAP) System, detected when the ECM cannot achieve or maintain the required vacuum level.
What symptoms indicate Error Code P0455?
- Engine Light ON: The check engine light or service engine soon warning light is illuminated on the dashboard, indicating a potential issue with the evaporative emission control system.
- Noticeable Fuel Odor: A strong fuel odor may be present, suggesting a release of fuel vapors due to a gross leak in the evaporative emission control system.
What causes OBD code Error Code P0455?
- The fuel cap may be missing, loose, or not properly secured, leading to a significant leak in the evaporative emission control system.
- An incorrect fuel filler cap can cause improper sealing, resulting in a gross leak detection.
- The fuel filler cap might remain open or fail to close completely, allowing vapors to escape.
- Foreign matter caught in the fuel filler cap can prevent it from sealing correctly, causing a leak.
- A leaking EVAP canister can allow fuel vapors to escape, triggering the error code.
- Hoses within the EVAP system may have cracks or disconnections, leading to vapor leaks.
- The fuel tank itself might have a leak, allowing vapors to escape and causing the system to detect a gross leak.
- A faulty fuel tank pressure sensor can give incorrect readings, falsely indicating a leak in the system.
How to fix OBD code Error Code P0455?
- Initial Inspection: Check the fuel tank filler cap to ensure it is properly tightened and not damaged. A loose or damaged cap is a common cause of the P0455 code.
- Visual Inspection of EVAP System: Inspect the EVAP system components, including hoses and connections, for signs of damage, disconnection, or wear that could cause a leak.
- Smoke Test: Perform a smoke test to identify any leaks in the EVAP system. Introduce smoke into the system and observe for any escaping smoke, indicating a leak.
- Check EVAP Purge and Vent Valves: Test the EVAP purge and vent valves for proper operation. Ensure they open and close correctly, as malfunctioning valves can cause a leak.
- Inspect Charcoal Canister: Examine the charcoal canister for any signs of damage or saturation, which could contribute to a leak in the EVAP system.
- Review Diagnostic Trouble Codes: Clear the P0455 code and perform a test drive to see if the code returns. If it does, further investigation into the EVAP system may be necessary.