how to fix P0456 code in Tesla Model S Plaid/Refresh (2021-present)?

Learn how to diagnose and fix P0456 EVAP leak in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, smoke machine, multimeter, socket set, torque wrench, replacement EVAP components (if needed).
• Disconnect the vehicle's battery before starting work on the EVAP system to prevent electrical malfunctions.

2. Inspect and Replace the Gas Cap

• Remove the gas cap and inspect it for cracks or damage.
• Clean the gas cap sealing surface on the fuel filler neck.
• If damaged, replace the gas cap with a manufacturer-approved part and ensure it is tightened properly.

3. Conduct Smoke Test

• Connect the smoke machine to the EVAP service port.
• Activate the smoke machine and observe for any smoke escaping from the EVAP system components.
• If leaks are found, repair or replace the affected component (e.g., hoses, valves).

4. Test and Replace EVAP Valves

• Locate the EVAP purge valve and vent valve.
• Use a multimeter to check for proper voltage and resistance according to the manufacturer's specifications.
• If either valve is faulty, remove it using the socket set and replace it with a new part, ensuring all connections are secure.

5. Clear Error Codes

• Reconnect the battery and use the OBD-II scanner to clear the P0456 code.
• Start the vehicle and allow it to reach operating temperature.