p0446
Moderate
Buick · SUVs
Evaporative Emission Control System Vent Control Circuit Error
Quick Answer
Error code P0446 on your Buick SUVs means: Evaporative Emission Control System Vent Control Circuit Error. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Scan and confirm error code
2
Inspect vent solenoid connector and wiring
3
Test solenoid coil resistance
4
Check for vacuum leaks
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 solenoid valve
Wiring connectors
Fuel cap
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