p0449
Moderate
Buick · SUVs
Evaporative Emission Control System Vent Control Circuit
Quick Answer
Error code P0449 on your Buick SUVs means: Evaporative Emission Control System Vent Control Circuit. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Check fuel cap and replace if damaged
2
Inspect vent valve solenoid with multimeter
3
Check wiring and connectors for damage
4
Test canister vent valve operation
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
Fuel cap
Vent solenoid valve
Wiring harness
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