What is OBD-II Code P2443 – AIR System Switching Valve Stuck Closed Bank 2

If you have been driving your vehicle and suddenly notice an illuminated check engine light, there are a few things that may come to mind. One of those things may be an issue with your vehicle’s Air Injection System. Specifically, OBD-II Code P2443 refers to an issue with the AIR System Switching Valve Stuck Closed Bank 2. In this article, we will discuss what this code means, potential causes, and how to repair the issue.

Understanding OBD-II Code P2443

OBD-II Code P2443 is specific to vehicles equipped with a Secondary Air Injection system. The purpose of the Secondary Air Injection is to introduce fresh air into the exhaust system to help reduce harmful emissions. Specifically, Code P2443 indicates a malfunction in Bank 2 of the AIR System Switching Valve Stuck Closed, which can cause a restriction in the flow of exhaust gases.

Potential Causes of Code P2443

There is a range of factors that can cause Code P2443 to appear on your vehicle’s diagnostic code reader. Here are some of the most common causes:

1. A faulty AIR System Switching Valve.
2. Issues with electrical connections related to the AIR System Swtching Valve.
3. Malfunctioning AIR System Control Solenoid and/or its wiring.
4. Failed Air Pump or its related wiring.
5. A damaged vacuum line or a leak in the Vacuum hose.
6. Dirt Build-up in the Air Inlet Control Vacuum Line.
7. A failed Engine Control Module (ECM) or Powertrain Control Module (PCM).

Symptoms of Code P2443

When Code P2443 appears, there are a few symptoms that may be noticeable:

1. Illuminated Check Engine Light.
2. Reduced engine performance.
3. Vehicle may hesitate upon acceleration.
4. Rough idling or stuttering.

Repairing Code P2443

If your vehicle is diagnosed with Code P2443, the most common repair is replacing the AIR System Switching Valve. However, before replacing the valve, several diagnostic tests are typically carried out to rule out other potential causes of the issue.

The first diagnostic step is to check the valve’s electrical connections and wiring harness. If there is any issue with the connection or wiring, it may be repaired or replaced.

Next, the Air Pump and its respective wiring must be examined to ensure that they are functioning correctly. If the Air Pump is not working, it needs to be replaced.

If the repair of the Air Pump or its wiring does not resolve the issue, it may be necessary to clean the vacuum hose and inlet control valve. An accumulation of dirt in this area can restrict the flow of air and trigger Code P2443. Cleaning these components can help to resolve the problem.

If cleaning these components does not repair the issue, the next diagnostic step is usually to replace the AIR System Switching Valve. Replacing the valve is a task that most mechanics can handle with ease and does not require advanced technical knowledge.

Frequently Asked Questions:

1. Is Code P2443 a severe issue?

Code P2443 is not a severe issue, but it can affect your vehicle’s performance. You should address it as soon as possible to avoid any potential problems.

2. Can I still drive my car with Code P2443?

If your vehicle is experiencing issues other than the illuminated check engine light, it’s best to have it towed to a mechanic to avoid any potential problems while driving.

3. How much does it cost to repair Code P2443?

The repair cost varies based on whether there are any underlying issues with the Air Pump or Vacuum hose. Replacing the AIR System Switching Valve typically costs between $200-$500.

4. Can Code P2443 be avoided altogether?

Issues with the AIR System are typically caused by a lack of proper maintenance. By following the manufacturer-recommended service intervals and having routine inspections done, you can avoid issues with your vehicle’s AIR System.

5. Will Code P2443 cause my car to fail an emissions test?

Yes, Code P2443 will cause your vehicle to fail an emissions test. It is important to have the issue resolved before a mandatory emissions test.


Code P2443 is an issue that requires prompt attention. While it is not a severe issue, delaying repairs can lead to more critical problems down the line. If your vehicle is experiencing symptoms of Code P2443, have it diagnosed by a professional mechanic as soon as possible. By addressing the issue promptly, you can avoid any potential problems while driving and prevent further damage to other engine components.

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