p0449
Moderate
GMC · SUVs
Evaporative Emission Control System Vent Control Circuit
Quick Answer
Error code P0449 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
Locate EVAP vent control solenoid
2
Test solenoid electrical connections
3
Inspect hoses for cracks or leaks
4
Check charcoal canister condition
5
Replace solenoid or repair hoses
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
EVAP solenoid
Hoses
Charcoal canister
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