p0446
Moderate
GMC · SUVs
Evaporative Emission Control System Vent Control Circuit
Quick Answer
Error code P0446 on your GMC 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 vent solenoid valve connections
2
Inspect vent hose for blockages
3
Test solenoid with multimeter
4
Clean vent filter if accessible
5
Replace solenoid if necessary
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
Vent hose
Inline filter
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