Secondary Air System Stuck On - Bank 1
The secondary air injection system is continuously running on bank 1.
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 computer thinks your secondary air system is always turned on, even when it shouldn't be. This usually happens because of a faulty valve or stuck component.
What the computer is actually seeing
The engine control module (ECM) detects that the secondary air injection system is operating when the engine is not in a condition that requires it, such as during cold start or when the engine is warmed up.
What a healthy reading looks like
ECM expects secondary air flow to be present during certain conditions (engine cold) and inhibited once warm. Air flow should be between 2.5 to 7.5 kg/h when engaged, and 0 when disengaged.
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 for visible wiring or connector damage at the secondary air valve and pump. Decision: Repair any visible damage. If no damage, proceed to step 2.
- 22. Verify that the secondary air pump operates correctly by applying direct power to it. Decision: If it runs, proceed to step 3. If not, replace the pump.
- 33. Inspect the secondary air intake valve for movement and seal integrity. Decision: If the valve is stuck or damaged, replace the valve.
- 44. Check for vacuum leaks in the secondary air system using a smoke machine or by visually inspecting hoses. Decision: Repair any leaks found.
- 55. Clear the code and test drive the vehicle. Monitor the system during cold starts and warm-up. Decision: If the code returns, further diagnose the ECM or consider physical blockages in the air system.
Common causes
- Faulty secondary air injection pump or valve
- Wiring issues or connector problems
- Vacuum leaks in the air system
- Damaged or corroded pipes in the secondary air system
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but you may notice increased emissions and potential performance loss.
Will this code come back after resetting?
Yes, if the issue isn't fixed, the code will likely return after a short period or the next cold start.
Why does this code show up with P0410?
P241C can appear alongside P0410 when there are multiple issues within the secondary air system that affect its operation.
Working a real vehicle right now?
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