2007 Toyota Tundra Error Code P2440

Troubleshooting and Resolving the P2440 Code in Toyota Tundras

Understanding the P2440 Code

The P2440 code is a diagnostic trouble code that signifies an issue with the secondary air injection system in your Toyota Tundra. This system is responsible for pumping air into the exhaust system during engine startup to reduce emissions. When the code is triggered, it means that the secondary air injection system switching valve (AISV) stuck open in bank 1, allowing air to enter the exhaust system when it should not.

Common Symptoms of the P2440 Code

• Illuminated Check Engine Light
• Rough idle
• Poor acceleration
• Increased emissions

Diagnosing and Fixing the P2440 Code

To diagnose and fix the P2440 code, follow these steps:

1. Review Possible Causes: Check the vacuum lines and hoses for any leaks or damage. Inspect the AISV for proper function and electrical connections.
2. Inspect the Vacuum Lines and Hoses: Look for cracks, kinks, or disconnections. Replace any damaged or worn components.
3. Test the AISV: Disconnect the electrical connector from the AISV and apply 12 volts to the terminals. The valve should open. If it does not, replace the AISV.
4. Inspect the Wiring Harness: Check the wiring harness for any damage, corrosion, or loose connections. Repair or replace as necessary.
5. Reset the Check Engine Light: Once the repairs are complete, connect a scan tool to the vehicle and reset the Check Engine Light.

If the P2440 code persists after following these steps, it may indicate a more complex issue with the engine management system. In this case, it is recommended to seek professional assistance from a qualified mechanic.

Additional Resources

• YourMechanic: P2440 OBD-II Trouble Code: Secondary Air Injection System Switching Valve Stuck Open Bank 1
• OBD-Codes: P2440