P2442
AIR System Switching Valve Stuck Open Bank 2
Secondary air injection
Generic OBD-II
Low
What it means
P2442 means the secondary air injection switching valve on bank 2 is stuck open, so air is fed into the exhaust when it shouldn't be. Secondary air injection is meant to run only briefly at cold start; a valve stuck open skews oxygen readings and can make the engine run slightly rough once warm. It's primarily an emissions fault — usually a carbon-stuck valve — and the car will fail a smog test until it's repaired.
Low
Can I keep driving? Yes — this is an emissions fault; the car drives normally, though it may run slightly rough when warm, and it will fail an emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no change in how the car drives
- Possible rough running or hesitation once the engine is warm
- May fail an emissions/smog test
Common causes
Most likely first
- Stuck-open air switching/diverter valve (carbon or debris)Likely
- Leaking or stuck check valve letting air through when it shouldn'tCommon
- Faulty valve control solenoid or vacuum lineCommon
- Faulty ECM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Scan and confirm P2442, then locate the bank 2 air switching valve.
- Inspect the switching valve and check valve for carbon or a stuck-open condition.
- Test the valve's operation and its vacuum/control signal.
- Check the control solenoid and hoses for leaks or sticking.
- Replace the valve if it's stuck, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2442?+
Yes. A switching valve stuck open lets air into the exhaust at the wrong times, which mainly upsets emissions. The car may run slightly rough when warm but is fine to drive; it will fail an emissions test until fixed.
Can I just clear P2442?+
It returns until the stuck valve is cleaned or replaced. Clearing the code won't free a mechanically stuck valve.
Related codes
Often seen with P2442
Read & clear P2442 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