how to fix P0440 code on Honda Accord 10th Generation (2018-2022)

Learn how to diagnose and fix P0440 EVAP system issues in Honda Accord 10th Generation (2018-2022). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery before working on electrical components.

2. Fuel Cap Inspection

• Remove the fuel cap and check for cracks or damage.
• Clean the sealing surface of the cap and the filler neck.
• Replace the fuel cap if damaged or if the seal is worn.

3. EVAP System Leak Repair

• Inspect and Replace Hoses:

  • Identify any damaged or cracked EVAP hoses.
  • Use a socket set to remove any clips or fasteners securing the hoses.
  • Replace any damaged hoses with new ones, ensuring secure connections.

• Replace Charcoal Canister (if necessary):

  • Disconnect any electrical connectors and hoses from the charcoal canister.
  • Remove mounting bolts using a socket set.
  • Install the new charcoal canister and reconnect all hoses and electrical connections.

4. Purge Valve and Vent Valve Testing

• Purge Valve:

  • Locate the EVAP purge valve near the intake manifold.
  • Disconnect the electrical connector and vacuum lines.
  • Test the valve with a multimeter to ensure it opens and closes properly.
  • Replace if faulty.

• Vent Valve:

  • Locate the vent valve, typically near the fuel tank.
  • Disconnect the electrical connector and vacuum lines.
  • Test using a multimeter similar to the purge valve.
  • Replace if faulty.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0440 code.
• Start the vehicle and monitor for any reoccurrence of the code.