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P0449 GMC

P0449 GMC - Evaporative Emission Vent Valve Solenoid Malfunction

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Possible causes
- Vacuum leaks, damaged hoses or improper routing
- EVAP system - Check fuel cap, canister, valves or components
- Faulty purge or vent solenoids
- Check connector and wiring
- Fuel saturated vapor canister
- Failed EVAP vent solenoid
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Tech notes
Check Engine Light Diag EVAP Codes





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When is the code detected?
The Engine Control Module (ECM) has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0449 GMC Description
The Engine Control Module (ECM) monitors the Evaporative Emission System (EVAP) Vent Valve/Solenoid system wiring for opens or shorts.
GMC Technical Service Bulletins for P0449 code
2003 GMC SIERRA CLASSIC ENGINE AND ENGINE COOLING:ENGINE Details
2003 GMC SIERRA CLASSIC ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL Details
2003 GMC SIERRA CLASSIC FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP Details
2004 GMC SIERRA CLASSIC ENGINE AND ENGINE COOLING:ENGINE Details
2004 GMC SIERRA CLASSIC ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL Details
2004 GMC SIERRA CLASSIC FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP Details
2005 GMC SIERRA CLASSIC ENGINE AND ENGINE COOLING:ENGINE Details
2005 GMC SIERRA CLASSIC ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL Details
2005 GMC SIERRA CLASSIC FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP Details
2006 GMC SIERRA CLASSIC ENGINE AND ENGINE COOLING:ENGINE Details
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