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

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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the Tesla on a flat surface and ensure the vehicle is in "Park."
• Disconnect the negative battery terminal to prevent electrical issues during repairs.

2. Inspect and Replace the Gas Cap

• Sub-step 1: Remove the gas cap and inspect the rubber seal for any damage or debris.
• Sub-step 2: If damaged, replace the gas cap with a new one that meets OEM specifications.
• Tools Required: None specific for this step.

3. Inspect EVAP Hoses and Connections

• Sub-step 1: Visually inspect all EVAP hoses for cracks or disconnections.
• Sub-step 2: Replace any damaged hoses with OEM parts.
• Tools Required: Socket set, pliers.

4. Perform Smoke Test

• Sub-step 1: Connect a smoke machine to the EVAP service port.
• Sub-step 2: Activate the smoke machine and observe for smoke escaping from any leaks in the system.
• Sub-step 3: Seal any identified leaks with appropriate repairs, such as hose replacement or sealing compound.
• Tools Required: Smoke machine.

5. Replace EVAP Canister (if necessary)

• Sub-step 1: Disconnect the EVAP canister from its mounting bracket.
• Sub-step 2: Disconnect all hoses and electrical connectors from the canister.
• Sub-step 3: Install the new canister by reversing the removal steps and ensuring all connections are secure.
• Tools Required: Socket set.

6. Test Purge Valve and Vent Valve

• Sub-step 1: Disconnect the electrical connector from the purge valve and vent valve.
• Sub-step 2: Use a multimeter to test for continuity and proper operation.
• Sub-step 3: Replace any faulty valves with OEM parts.
• Tools Required: Multimeter.