how to fix P0455 code on my Honda Civic 11th Generation (2022-Present)

Learn how to diagnose and fix P0455 code in Honda Civic 11th Generation. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather the following tools and parts:
  • OBD-II scanner
  • Smoke machine
  • Basic hand tools (socket set, pliers)
  • Replacement fuel cap (if defective)
  • Replacement EVAP hoses (if damaged)

2. Inspect and Replace Fuel Cap

• Remove the existing fuel cap.
• Inspect the rubber seal on the cap for wear or damage.
• If damaged, replace with a new fuel cap. Ensure it is the correct OEM part for a 2022 Honda Civic.
• Reinstall the fuel cap and ensure it clicks into place securely.

3. Inspect EVAP System Components

• Visually inspect the EVAP hoses connected to the fuel tank and charcoal canister for damage.
• If any hoses are cracked or disconnected, replace them with new hoses that meet OEM specifications.
• Ensure all connections are secure and without leaks.

4. Perform Smoke Test

• Connect the smoke machine to the EVAP system through the service port.
• Activate the smoke machine to introduce smoke into the EVAP system.
• Observe for any smoke escaping from the hoses, canister, or other EVAP components indicating a leak.
• If leaks are found, repair or replace the affected components as necessary.

5. Check Purge Valve

• Locate the purge valve (typically near the intake manifold).
• Disconnect the electrical connector and apply 12V to the valve to check for operation.
• If the valve does not open, replace it with a new part.
• Reconnect all electrical connections after testing.

6. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0455 code after repairs.
• Test drive the vehicle to ensure that the check engine light does not reappear and that the vehicle operates smoothly.