Secondary Air Injection System Malfunction
What does P0410 mean?
The P0410 code means the vehicle's onboard diagnostic system has detected: Secondary Air Injection System Malfunction. This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Loud noise from air pump area on cold start
- Rough idle during cold start
- Failed emissions test
- Sulfur or rotten egg smell on cold start
Probable Causes (Ranked by Likelihood)
- Failed secondary air injection pump Very High
- Stuck or failed air injection check valve High
- Clogged or deteriorated air injection hoses Moderate
- Faulty air pump relay or fuse Moderate
- Failed air pump control solenoid valve Low
Step-by-Step Diagnostic Procedure
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Listen for the air pump running during cold start -- it should run for 30-120 seconds
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Check the air pump fuse and relay -- swap the relay with a known-good one if available
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Inspect air injection hoses for cracks, collapse, or water intrusion
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Command the air pump on with a scan tool and verify airflow at the check valve
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Check the air injection check valve for proper sealing and movement
Frequently Asked Questions
Can I drive with code P0410?
Yes. The secondary air injection system only operates during cold starts to help the catalytic converter warm up faster. It does not affect normal driving performance, but you will fail emissions testing.
What does the secondary air injection pump do?
The air pump injects fresh air into the exhaust manifold during cold starts. This extra oxygen helps burn unburned fuel in the exhaust and heats the catalytic converter faster to reduce cold-start emissions.
Is the secondary air pump expensive to replace?
The pump itself costs $100-$400 depending on the vehicle. Labor varies from $100-$300. On some vehicles like GM trucks, moisture entering the pump through deteriorated check valves is a common failure mode.