P0414
PowertrainSecondary Airlow severitySecondary Air Injection System Switching Valve A Circuit Shorted
What P0414 Means
The PCM detected a short in the secondary air injection switching valve A circuit. This affects air delivery to the exhaust during cold operation.
Symptoms
- Check engine light on
- Failed emissions test
- Rough cold running
Common Causes
- Shorted valve A
- Chafed or grounded wiring
- Faulty valve solenoid
- Faulty PCM driver
Diagnostic Steps
- Scan and confirm P0414
- Inspect wiring for shorts
- Measure valve resistance
- Verify PCM control circuit
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