Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
The P0449 is pointing to a fault in the Evaporative Emission Canister Vent Solenoid Valve. Check the lines between the solenois and the canister for any physical defects, check the electrical connector for any loose/broken wires. If the visual inspection checks ok, suspect a faulty solenoid (very common GM fail item).
1 - Fuel Tank2 - Fuel Pump and Sender Assembly3 - Fuel Tank Pressure (FTP) Sensor4 - Evaporative Emission (EVAP) Canister Vent Solenoid
Remove the EVAP canister vent solenoid valve bracket bolt.
need help on a 1999 Chevy K3500 pickup with a 7.4 L