Secondary Air Injection System Switching Valve A Stuck Open
The secondary air injection system's valve A is stuck in the open position.
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What it means (plain English)
In this code, valve A of the secondary air injection system isn't closing like it should, meaning it's letting air flow when the engine doesn't want it, which can affect engine performance and emissions.
What the computer is actually seeing
The engine control module (ECM) monitors the position of the secondary air injection system's valve A. It expects the valve to close during certain conditions but sees it remains open or doesn't respond as expected.
What a healthy reading looks like
Voltage at the valve connector should be around 12V with the key on; the resistance of the valve should be between 10-30 ohms.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connectors to the secondary air injection valve A for damage or corrosion. Replace or repair as necessary.
- 22. Measure the voltage at the valve connector with the key in the ON position. It should be around 12V. If not, trace the power source.
- 33. Check the resistance of the secondary air valve A. It should be between 10-30 ohms. If it's out of this range, replace the valve.
- 44. Inspect any hoses and passages for blockages. Clean or replace as needed to ensure proper airflow.
- 55. Clear the fault code and test drive the vehicle to see if the code returns.
Common causes
- Faulty secondary air injection valve (A)
- Wiring issues or damaged connectors
- Faulty engine control module (ECM)
- Blocked air passages in the secondary air system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive but expect reduced performance and increased emissions. It's best to fix it sooner rather than later.
Will this code come back after repairs?
If the root cause is not fixed, yes, it likely will return. Make sure to thoroughly check all components.
Why does this code pair with P2422?
Both codes relate to the secondary air injection system; one may cause the other if not resolved.
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