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The secondary air injection (SAI) system helps in the oxidizing process of the exhaust system during cold start-up. It supplies the exhaust system with fresh air to reduce harmful exhaust emissions that could escape when the air-fuel mixture is rich. The SAI system can either be electrically or belt-driven and has a switching valve that controls airflow. If the powertrain control module (PCM) detects a problem with the switching valve, it will log a P2443 code.

What Does the P2443 Code Mean?

Diagnostic trouble code (DTC) P2443 stands for “Secondary Air Injection System Switching Valve Stuck Closed Bank 2.”

secondary air injection pump of sai system
The SAI system has a pump that pulls in fresh air through an external filter and passes through each exhaust port before it reaches the connecting hoses or manifold.

The SAI system has a pump that pulls in fresh air through an external filter and passes through each exhaust port before it reaches the connecting hoses or manifold. The system also has one or more check valves located between the manifold and switching valves. These valves help protect the pump and other parts from reverse exhaust flow, which occurs when the exhaust pressure exceeds injection pressure.

Note: The definition of code P2443 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P2443 Code?

What are the Common Symptoms of the P2443 Code?

How to Diagnose the P2443 Code

Diagnosing a P2443 usually involves using a scan tool and inspecting the SAI system for damaged or corroded wiring and connectors. The process can also require some additional steps, depending on the vehicle’s year, make, and model. If you’re not familiar with the diagnostic process, it might be best to have a certified mechanic do the job for you to ensure that all steps and protocols are followed correctly.

But if you think you can handle the task on your own, take a look at this video to get an idea of what the process might involve.

How to Fix the P2443 Code

Attempting to fix a P2443 code can be a frustrating and confusing task, especially without the right tools and technical information. It might even lead to further complications and more expensive repairs if done incorrectly. Under these circumstances, bringing your vehicle to a trained professional might be your best bet to resolve the issue.

But if you’re someone who’s had their fair share of dealing with trouble codes before, then you probably know that umbrella fixes don’t exist. Before working on your vehicle, make sure to have the right information. Guides like those from Chilton or an ALLDATA subscription contain vehicle-specific repair information, so you might want to check those out before you begin.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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