p0449
Moderate
Cadillac · SUVs
Evaporative Emission Control System Vent Control Valve Stuck Open
Quick Answer
Error code P0449 on your Cadillac SUVs means: Evaporative Emission Control System Vent Control Valve Stuck Open. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Connect diagnostic scanner and verify code
2
Inspect vent control valve operation
3
Check purge control solenoid
4
Clear code and monitor for recurrence
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Vent control valve
Purge solenoid
Scanner tool
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