P0415
PowertrainSecondary Airlow severitySecondary Air Injection System Switching Valve B Circuit Open
What P0415 Means
The PCM detected an open circuit in the secondary air injection switching valve B. This valve routes fresh air into the exhaust to lower cold-start emissions.
Symptoms
- Check engine light on
- Failed emissions test
- Increased cold-start emissions
Common Causes
- Faulty switching valve B
- Open wiring or connector
- Blown fuse or relay
- Faulty PCM driver circuit
Diagnostic Steps
- Scan and confirm P0415
- Inspect valve B wiring
- Check valve resistance and voltage
- Test PCM control signal
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for P0415?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix