Secondary Air Injection System Switching Valve Stuck Closed (Bank 1)
The secondary air injection valve for Bank 1 is not functioning correctly.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The valve that helps reduce emissions by injecting air into the exhaust system is stuck closed, preventing proper operation.
What the computer is actually seeing
The engine control module (ECM) expects the secondary air injection system to operate during a cold start but does not see the expected air flow due to a stuck closed valve.
What a healthy reading looks like
The secondary air injection system should activate within 10 seconds of starting the engine; you should see a voltage between 0.5V to 4.5V on the valve control circuit when activated.
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. Inspect the wiring and connector to the secondary air injection valve for damage or corrosion. If damaged, repair or replace the wiring/connector. Decision Point: If wiring/connector is good, proceed to step 2.
- 22. Check the operation of the secondary air injection valve. Apply power directly to the valve. Valve should open and allow air through. Decision Point: If the valve operates, proceed to step 3; if it doesn't, replace the valve.
- 33. Check for blockages in the air injection system (hoses and check valves). Clean or replace as needed. Decision Point: If no blockages are found, proceed to step 4.
- 44. Test the continuity and resistance of the valve control circuit. Expect 20-25 ohms resistance. Decision Point: If resistance is out of spec, repair the circuit; if good, consider a faulty ECM.
Common causes
- Stuck or defective secondary air injection valve
- Wiring issue or connector corrosion
- Clogged air injection system
- Faulty ECM or incorrect calibration
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but emissions may be higher, and it could lead to further issues if ignored.
Will this code come back after clearing it?
It may come back if the underlying issue isn't fixed.
Why does this code occur with P0410?
Both codes relate to the same air injection system, one indicating performance while the other indicates a system fault.
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