how to fix P0456 EVAP system leak detected code on 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 tools and necessary parts.
• Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace the Gas Cap

• Sub-steps:
  • Remove the gas cap and visually inspect for cracks or wear.
  • Replace with a new, OEM-spec gas cap if damaged.
  • Reinstall the gas cap and ensure it is tightened properly.

3. Repair or Replace EVAP Components

• Sub-steps:
  • If a leak is detected during smoke testing, identify the source.
  • Replace any damaged hoses or the EVAP canister as needed.
  • If the purge valve is faulty, remove it from its mounting bracket.
  • Install a new purge valve, ensuring it is securely connected.

4. Clear Codes and Test

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0456 code.
  • Start the vehicle and allow it to reach operating temperature.
  • Conduct a test drive to monitor the system's functionality.

5. Final Inspection

• Sub-steps:
  • After the test drive, re-scan for error codes to ensure no new codes have appeared.
  • Monitor for any abnormal sounds or smells during operation.

Tools Required:

• OBD-II scanner
• Smoke machine
• Basic hand tools (sockets, wrenches)
• Torque wrench
• Replacement parts (gas cap, EVAP canister, hoses, purge valve)

Parts Required:

• New gas cap (if damaged)
• EVAP purge valve (if faulty)
• EVAP hoses (if cracked)
• EVAP canister (if damaged)

Estimated Repair Time: 1-3 hours

Safety Warnings:

• Disconnect the battery before working on electrical components.
• Ensure the vehicle is cool before inspecting the EVAP system to avoid burns.