p0449
Moderate
GMC · Trucks
EVAP Vent Valve Circuit
Quick Answer
Error code P0449 on your GMC Trucks means: EVAP Vent Valve Circuit. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Locate EVAP vent valve under vehicle
2
Test solenoid valve with multimeter
3
Inspect vacuum hoses for damage
4
Check electrical connector for corrosion
5
Replace vent valve if solenoid test fails
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 vent valve solenoid
Vacuum hose
Electrical connector
Hose clamp
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