how to clear the P0456 code on my Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather tools: OBD-II scanner, smoke machine (if needed for leak testing), and replacement gas cap (if necessary).
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the negative battery terminal for safety, if required.

2. Inspect and Replace Gas Cap

• Sub-step 1: Remove the gas cap from the fuel filler neck.
• Sub-step 2: Inspect the gas cap for cracks, damaged seals, or foreign debris.
• Sub-step 3: If damaged, replace the gas cap with an OEM or high-quality aftermarket part.
• Sub-step 4: Reinstall the new gas cap, ensuring it is tightened securely.

3. Check EVAP System Components

• Sub-step 1: Inspect the EVAP hoses for any signs of wear or damage.
• Sub-step 2: Check all connections to the EVAP canister and purge valve for tightness and integrity.
• Sub-step 3: Replace any damaged hoses or connectors as necessary.

4. Perform Smoke Test (if required)

• Sub-step 1: Connect the smoke machine to the EVAP service port.
• Sub-step 2: Introduce smoke into the EVAP system and observe for leaks.
• Sub-step 3: Repair any identified leaks by replacing the faulty components.

5. Clear Code and Test Drive

• Sub-step 1: Use the OBD-II scanner to clear the P0456 code from the system.
• Sub-step 2: Reconnect the negative battery terminal (if disconnected).
• Sub-step 3: Start the vehicle and perform a test drive, monitoring for any reappearance of the check engine light.