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P2446 OBD-II Trouble Code: Secondary Air Injection System Pump Stuck on Bank 2

check engine light

P2446 code definition

A P2446 indicates a problem has been detected in the vehicle's pressure sensor circuit or secondary air injection pump.

What the P2446 code means

A P2446 code refers to a potential issue with the secondary air injection pump. This air injection pump is used to reduce car emissions. In the instance of this code, something is negatively affecting the pump's flow and pressure ratings. In rarer cases, the problem may lie with the pressure sensor itself.

What causes the P2446 code?

In many cases, a P2446 is caused by water from the exhaust damaging the secondary air pump in colder weather. If the pump's pressure and flow varies by more than 10% from the manufacturer's prescribed setting, the code will be logged in the vehicle's computer.

What are the symptoms of the P2446 code?

Drivability issues will arise from a lack of proper engine ventilation. This may result in poorer engine responsiveness or even stalling. Abnormal noise from the secondary air pump is often the most prominent symptom behind a P2446 code.

How does a mechanic diagnose the P2446 code?

An OBD-II code reader will pick up the P2446 code when it is inputted into the vehicle's computer. A P2446 problem may be diagnosed by running and checking the secondary air pump to see if it's working properly. If the pump's pressure and flow is at least 10% below the default factory target setting, it will be sufficient cause to diagnose it as a P2446 issue.

Common mistakes when diagnosing the P2446 code

The check valves and water drain should be inspected and repaired as needed before replacing the secondary air injection pump itself. In addition, it may be the pressure sensor itself that is misreading an otherwise stable air injection pump. If you have received a P2446 code but haven't experienced any practical symptoms of a problem, you should consider the pressure sensor as a potential issue.

How serious is the P2446 code?

Repeated failure of the secondary air pump will compromise the vehicle's engine if left unchecked. Although the symptoms are usually mild at first, the problem should be addressed promptly.

What repairs can fix the P2446 code?

Wiring and connectors relating to the secondary air pump and pressure sensor circuit should be inspected and repaired as required. One-way check valves and water drainage should be replaced or repaired as needed before considering larger repairs. In cases where the secondary air pump has been significantly damaged, it may need to be replaced with a new copy. Afterwards, retest the car each time you make a repair to confirm the issue has been solved.

Additional comments for consideration regarding the P2446 code

"Bank 2" refers to the bank of the engine opposite from the bank that houses the number one cylinder. Your vehicle's service manual should indicate which engine bank is which.

Need help with a P2446 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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