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What does Error Code P0455 mean?

Moderate Issue
DTC Code P0455 indicates a Gross Leak in the Evaporative Emission Control System, detected when the ECM fails to achieve or maintain a calibrated vacuum level in the EVAP system.

What are the symptoms of Error Code P0455?

  • Engine Light ON: The check engine light or service engine soon warning light illuminates, indicating a potential issue with the evaporative emission control system.
  • Noticeable Fuel Odor: A strong fuel odor may be present due to the release of fuel vapors, suggesting a gross leak in the evaporative emission control system.

What causes 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 might be used, which does not seal the system effectively.
  • The fuel filler cap could remain open or fail to close completely, allowing vapors to escape.
  • Foreign matter could be caught in the fuel filler cap, preventing a proper seal.
  • The EVAP canister might have a leak, causing a disruption in the system's ability to contain fuel vapors.
  • There could be a leak in the EVAP system hose, allowing vapors to escape into the atmosphere.
  • The fuel tank itself might have a leak, contributing to the gross leak detected by the system.
  • A faulty fuel tank pressure sensor could incorrectly signal a leak when there is none, or fail to detect an actual leak.
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How to fix Error Code P0455?

  • Initial Inspection: Check the fuel tank filler cap to ensure it is properly tightened. 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 or disconnection.
  • 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 Valve: Test the EVAP purge valve for proper operation. Ensure it opens and closes correctly and is not stuck in one position.
  • Inspect EVAP Vent Valve: Verify the functionality of the EVAP vent valve. Ensure it is not clogged or stuck, which could cause a gross leak.
  • Review Fuel Tank Integrity: Examine the fuel tank for any signs of damage or leaks that could contribute to the P0455 code.
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