Looking for the evap canister vent valve on a 2006 Silverado

DTC P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit.
Circuit Description
An ignition voltage is supplied to the evaporative emission (EVAP) canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve by means of an internal switch called a driver. The scan tool displays the commanded state of the EVAP canister vent solenoid valve as ON or OFF. The control module monitors the status of the driver. If the control module detects an incorrect voltage for the commanded state of the driver, this DTC sets.

Do you know how to test automotive electrical circuits using a volt meter ? How to test a transistor (driver) inside the PCM . Videos on youtube. Do you know what a wiring diagram is ?
Also search P0449 on youtube . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click engine ,then under subsystem click fuel controls . Click search the blue link. Scroll down to #9 diagram . Circuit for vent solenoid . This video is a chevy truck ,doesn't matter .
GMC Chevy Truck DTC P0449 EVAP Vent Solenoid Control Circuit

DTC P0449: Evaporative Emission (EVAP) Vent Solenoid Control Circuit , your vent solenoid is opened or the wiring circuit is . The vent solenoid is by the charcoal canister at the gas tank .
P0449 Battery voltage is supplied to the EVAP canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve by means of an internal switch called a driver. The scan tool displays the commanded state of the EVAP canister vent solenoid valve as ON or OFF. The control module monitors the status of the driver.

What about it ? What would you like to know ? Where is it , what is it ? What engine does yours have , six different possibilities .
DTC P0449: Evaporative Emission (EVAP) Vent Solenoid Control Circuit.
Battery voltage is supplied to the EVAP canister solenoid valve. The ECM grounds the EVAP canister vent solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the driver. A scan tool will display the commanded state of the EVAP canister vent solenoid valve as ON or OFF. P0449 Vent Valve Testing EVAP Systems

P0449 - OBD-Codes.com

www.obd-codes.com/p0449

Detailed information on diagnosing and repairing a P0449 DTC code which refers ...P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit ... OBD-IITrouble Code Technical Description ... 2004 Chevrolet Tahoe 4.8L p0449

EVAP Code P0449 - YouTube

? 16:47
https://www.youtube.com/watch?v=AlfOSMmisPg
Mar 13, 2013 - Uploaded by realfixesrealfast
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https://www.youtube.com/watch?v=aL5KmV1d26Y
Dec 27, 2013 - Uploaded by wagslick
Quick Easy Fix P0449 P0455 Evap Codes on Chevy Silverado 2007 .... Well clearing the error codes at auto store will not prevent it come ...

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P0449: EVAP Emission Control System Vent Vlv/Sol Malf

- Purge Control Valve harness is open or shorted
- Purge Control Valve electrical circuit poor connection
- Faulty canister vent control valve

p0449 is EVAP (Evaporative Emission System) purge/vent solenoid circuit condition

possible causes are-- purge or vent valves are defective, check connector and wiring, fuel saturated vapor canister, Failed EVAP vent solenoid. plus check all hoses good. check for a bad fuel cap seal. remove cap and replace it, erase code and see if it comes back. go to this site maybe it will help you. www.gm-trucks.com/forums/index.php?showtopic=40659

P0449 is the evap vent valve solenoid circuit malfuntion.
P0455 is an evap gross leak
Perhaps the gross leak code has to do with the vent valve. Find the vent valve. It should be near a rectangle evap canister. Maybe under the bed. The small vent line from the fuel tank will go to it. The solenoid is near the cansiter. With the key off the valve will be open. With the key on it should be closed. You may try disconnection the hose and blow through it with both key off and on and see if air will pass through. If the valve has died and is stuck open, that can be the huge leak.

If it is not the leak then a smoke machine should be used. Easier than searching the lines for bad o-rings, splits, or whatevers.

replace the Evaporative Emissuon (EVAP) canister vent solenoid valve. incorrect voltage at driver

Hello. Your code indicates that your emission system is acting up. If you live in California, you might have a problem passing the next mandatory emmissions test. The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

Definition:
EVAP (Evaporative Emission System) purge/vent solenoid circuit condition

Explanation:
The solenoids and system wiring are monitored for opens or shorts

Probable Causes
1- Purge or vent solenoids defective
2- Check connector and wiring
3- fuel, saturated vapor canister
4- Failed EVAP vent solenoid

DTC P0449 Evaporative Emission (EVAP) vent Solenoid Control Circuit
The vent solenoid is not working properly. The ecm driver could be defective, the wiring could be broken, or the vent solenoid just isn't working.