P2440 Fault Code

Secondary Air Injection System Switching Valve Stuck Open Bank 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2440 fault code indicates that the secondary air injection system's switching valve for bank 1 is stuck in the open position. This system is designed to reduce emissions during cold starts by injecting fresh air into the exhaust system to help burn off excess hydrocarbons. When the valve is stuck open, it can lead to a variety of performance issues and increased emissions.

What are the symptoms of the P2440 code?

Common symptoms associated with the P2440 fault code include:

• Increased emissions during vehicle operation.
• Possible rough idling or decreased engine performance.
• A check engine light illuminated on the dashboard.
• Unusual noises from the engine bay related to the secondary air injection system.

What causes the P2440 code?

There are several potential causes for the P2440 code including:

• A malfunctioning secondary air injection valve that is physically stuck open.
• A fault in the electrical circuit or wiring connected to the valve.
• A vacuum leak that may cause the valve to remain open.
• Issues with the engine control unit (ECU) that may incorrectly command the valve to be open.

How to fix P2440?

To resolve the P2440 fault code, consider the following steps:

• Inspect the secondary air injection valve for damage or blockage and replace if necessary.
• Check electrical connections and wiring related to the valve for shorts or corrosion.
• Test the vacuum lines connected to the system for leaks or disconnections.
• If the issue persists, it may be necessary to perform an ECU update or reset the system.