how to fix the P0456 code on my 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, basic hand tools (ratchet set, screwdrivers).
• Disconnect the vehicle's battery to ensure safety during repairs.
• Allow the vehicle to cool down if recently driven.

2. Inspect and Replace Gas Cap

• Sub-steps:
  • Remove the gas cap and inspect for cracks or damage.
  • If damaged, replace with an OEM gas cap.
  • Reinstall the new gas cap and ensure it is tightened properly.

3. Repair or Replace EVAP Components

• Sub-steps:
  • Visually inspect all EVAP hoses and connections for wear or damage.
  • Replace any damaged hoses or fittings.
  • If the smoke test indicated a leak, locate the source and repair as necessary (e.g., replace hoses or fittings).
  • Test the EVAP purge valve by applying voltage and ensuring it opens and closes properly; replace if faulty.

4. Reset the ECU

• Sub-steps:
  • Reconnect the vehicle's battery if it was disconnected.
  • Use an OBD-II scanner to clear the P0456 code from the ECU.
  • Monitor for any reoccurrence of the code after a short test drive.