how to fix P0455 code in Genesis G70 IG (2017-2023)

Learn how to diagnose and fix P0455 large leak in the EVAP system of Genesis G70 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, smoke machine, basic hand tools, torque wrench, replacement gas cap (if needed), EVAP hose kit (if needed).
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Gas Cap

• Remove the gas cap and inspect it for cracks or damage.
• If any damage is found, replace the gas cap with an OEM equivalent.
• Reinstall the gas cap by ensuring it clicks securely.

3. Inspect EVAP Hoses and Components

• Remove any protective covers to access the EVAP hoses.
• Visually inspect the hoses for cracks, kinks, or disconnections.
• Replace any damaged hoses with OEM parts.
• Ensure all connections are tight and secure.

4. Smoke Test the EVAP System

• Connect the smoke machine to the EVAP service port.
• Activate the smoke machine to introduce smoke into the system.
• Observe for smoke escaping from any leaks.
• Repair any identified leaks by replacing faulty components or sealing connections.

5. Check and Test EVAP Purge Valve

• Locate the EVAP purge valve, usually mounted near the intake manifold.
• Disconnect the electrical connector and vacuum line from the valve.
• Apply battery voltage to the valve to check for operation; it should open and close.
• If the valve is defective, replace it with an OEM part.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0455 code from the system.
• Start the vehicle and allow it to reach operating temperature.