P2440
PowertrainSecondary Airmoderate severitySecondary Air Injection System Switching Valve Stuck Open Bank 1
What P2440 Means
The secondary air injection switching valve on bank 1 is stuck in the open position.
Symptoms
- Check engine light
- Failed emissions test
- Noise from air injection system
Common Causes
- Carbon deposits in valve
- Failed diaphragm
- Broken valve spring
- Vacuum supply issue
Diagnostic Steps
- Inspect valve operation
- Check vacuum supply
- Listen for air injection noise at idle
Where to start: Replace secondary air switching valve.
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