install updated vent control solenoid valve and jumper harness.
Evaporative Emission Control System Vent Control Circuit Malfunction, look for faulty vent valve or a short on the vent control circuit.
Code PO499 = Evaporative Emission System vent control circuit high. Problem can be a loose or defective gas cap, blocked gas vent, EVAP/Carbon canister purge valve fault, or loose, cracked, or broken vacuum hose.
The car code p0446 is a faulty vent valve. To fix this problem, the vent valve will need to be replaced.
The DTC P0449 is: EVAP Emission Control System Vent Vlv/Sol Malf Straight out of my code book. Hope this helps you out.
Trouble code P0443 means: EVAP Canister Purge Volume Control Solenoid Valve
Check for vacuum leaks and good electrical connection at the EVAP vent solenoid
No. Just brought mine to the dealer and found that out. The replacement part for the the Hummer will fit and is under $30 at AutoZone. Only a ten minute fix.
Trouble code P0446 means: EVAP Vent System Performance
You need to put a vent and a PCV valve in the valve covers.
Trouble Code P1457 means:Evaporative emissions EVAP control system leakage So to fix it you need to replace the EVAP Canister
Replace the vent valve. Repair open, short, or resistance problem in the control circuit. Repair an open, or short, or resistance problem in the power circuit, or replace the PCM.