It's located under the vehicle back behind the fuel tank , Installed in the canister !
Remove the EVAP canister vent solenoid valve from the canister !
Rotate the EVAP canister vent solenoid valve counterclockwise in order to release it from the locked position.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Disconnect the evaporative emission (EVAP) canister harness electrical connector (2) from the EVAP vent solenoid valve. Clean away any debris that may be present around the EVAP canister vent solenoid valve.
Remove the EVAP canister bolt. Lower the EVAP canister.
SOURCE: OBD code P0499, P0499 NVLD Canister Vent Valve Solenoid, Cause?
its above ur fuel tank from what i kno of but it could be ur canister or just a short in the wire to ur solenoid
SOURCE: how to change air filter 2006 colbalt ss
Its a pain but under your car are about 6 8mm bolts that you have to take off to get the filter out also you will have to take your driver front tire off to get the last few bolts to gain access to the air box there are 3 screws on the box that comes off and you can pull out the filter and put new one in and do the reverse.
SOURCE: The check engine light on my Chevy Silverado cam
That is laymans terms. That is why it is in your manual. You ,need to get up to speed ,on todays somewhat high tech vehicles.
Now you need to go to a shop that does EVAP testing, with a smoke machine,if necessary,or at least put a scanner on it ,and replace the vent valve solenoid,if bad.(again laymans part teminology,
SOURCE: 2006 gmc sierra 1500 4.3 . check engine light on.
More than likely the evaporator vent valve.
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