how to resolve P0456 code in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Gas Cap

• Remove the gas cap and inspect the rubber seal for cracks or damage.
• If damaged, replace the gas cap with an OEM (Original Equipment Manufacturer) part.
• Reinstall the new gas cap ensuring it clicks securely in place.

3. Inspect EVAP System Components

• Locate the EVAP system components: charcoal canister, purge valve, and associated hoses.
• Visually inspect all hoses for cracks, kinks, or loose connections.
• Replace any damaged hoses or components with OEM parts as needed.

4. Perform Smoke Test

• Connect the smoke machine to the EVAP service port.
• Introduce smoke into the EVAP system and closely monitor for leaks.
• If leaks are detected, identify the source and replace the faulty component (e.g., hoses, canister).

5. Clear Codes and Test Drive

• Reconnect the battery terminal.
• Use an OBD-II scanner to clear the P0456 code from the system.
• Test drive the vehicle for at least 20 minutes to allow the system to run self-diagnostics.