P2443
AIR System Switching Valve Stuck Closed Bank 2
Secondary air injection
Generic OBD-II
Low
What it means
P2443 means the secondary air injection (SAI) switching valve on bank 2 is stuck closed — it isn't opening to let the air pump push fresh air into the exhaust at cold start. Usually the valve is seized with carbon or moisture, or its vacuum/electrical control has failed. It's an emissions fault; the engine runs and drives normally, but the vehicle will fail emissions until it's fixed.
Low
Can I keep driving? Yes — the car drives normally. The stuck valve only affects cold-start emissions and the secondary-air monitor; it will fail emissions until fixed.
Common symptoms
What you'll notice
- Check-engine light on — usually the only symptom
- May fail an emissions or smog test
- No noticeable change in power in most cases
- Occasionally a slightly rough cold start
Common causes
Most likely first
- SAI switching valve seized/stuck closed with carbon or moistureLikely
- Failed vacuum or electrical control to the switching valveCommon
- Faulty air pump or check valve on bank 2Common
- Vacuum leak or broken hose to the valveLess often
- Wiring or connector fault at the valve controlLess often
How to diagnose & fix
Work through it in order
- Inspect and test the bank 2 SAI switching valve; clean or replace it if seized.
- Check its vacuum/electrical control and hoses for leaks or faults.
- Verify the air pump and check valve are working.
- Repair control wiring or replace the valve as needed.
- Clear the code and confirm the SAI monitor passes.
FAQ
Quick answers
Is it safe to drive with P2443?+
Yes. It's an emissions fault with no effect on power or safety, but it should be repaired so the car passes emissions.
Can I just clear P2443?+
It returns once the SAI monitor runs unless the stuck valve or its control is repaired.
Related codes
Often seen with P2443
Read & clear P2443 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX