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
– 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
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 CHEVROLET Description
The Engine Control Module (ECM) monitors the Evaporative Emission System (EVAP) Vent Valve/Solenoid system wiring for opens or shorts.
CHEVROLET Technical Service Bulletins for P0449 code
2003 CHEVROLET SILVERADO CLASSIC ENGINE AND ENGINE COOLING:ENGINE
2003 CHEVROLET SILVERADO CLASSIC ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL
2003 CHEVROLET SILVERADO CLASSIC FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP
2004 CHEVROLET SILVERADO CLASSIC ENGINE AND ENGINE COOLING:ENGINE
2004 CHEVROLET SILVERADO CLASSIC ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL
2004 CHEVROLET SILVERADO CLASSIC FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP
2005 CHEVROLET SILVERADO CLASSIC ENGINE AND ENGINE COOLING:ENGINE
2005 CHEVROLET SILVERADO CLASSIC ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL
2005 CHEVROLET SILVERADO CLASSIC FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP
2006 CHEVROLET SILVERADO CLASSIC ENGINE AND ENGINE COOLING:ENGINE