P0413
PowertrainSecondary Airlow severitySecondary Air Injection System Switching Valve A Circuit Open
What P0413 Means
The PCM detected an open electrical circuit in the secondary air injection switching valve A. This valve controls airflow used to reduce emissions during cold starts.
Symptoms
- Check engine light on
- Failed emissions test
- Rough cold start idle
Common Causes
- Faulty switching valve A
- Open wiring or connector
- Blown fuse or relay
- Faulty PCM driver circuit
Diagnostic Steps
- Scan and confirm P0413
- Inspect valve wiring and connectors
- Check valve resistance and voltage
- Test PCM control signal
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