Where is thevapor canister vent solenoid located on a 2007 Silverado 1500 6.0L 4x4

P0307: Cylinder 7 Misfire Detected https://www.autocodes.com/p0307_chevrolet.html

P0449: Evaporative Emission Vent Valve Solenoid Malfunction https://www.autocodes.com/p0449_chevrolet.html

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.

No you don't have to remove the pick up bed to get at it. It's on the left frame rail along side of fuel tank !
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle . Disconnect the evaporative emission (EVAP) canister vent electrical connector, if equipped. Disengage the 2 vent valve pipe clips securing the pipe to the underbody.
Remove the clips from the underbody and discard.
Disconnect the vent valve pipe at the EVAP canister. Remove and retain the EVAP canister vent valve bracket mounting bolt. Remove the complete EVAP canister vent valve assembly with bracket attached and discard.
Notice: Refer to Fastener Notice in the Preface section.
Video on youtube !

follow the vacuum line from the canister should be on or near the intake manifold

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.

Trouble Code: P0499

NVLD Canister Vent Solenoid Circuit High

Possible Causes:


NVLD canister vent solenoid control circuit is open or is shorted to power.NVLD canister vent solenoid ground circuit is open.NVLD canister vent solenoid is damaged or it has failed.PCM has failed.Mr. Perkins,here are the causes for the code.

P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit

P0455 - Evaporative Emission (EVAP) System Leak Detected

Many times this is caused by the canister vent solenoid. You can definitely hook the smoke to it but quite often is just that particular solenoid malfunctioning.

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

P0499 Evaporative Emission System Vent Valve Control Circuit High, REPLACE THE SOLENOID.

DTC P0446 Evaporative Emission (EVAP) Vent System Performance

The vehicle control module (VCM) monitors the performance of the evaporative emission (EVAP) system by applying a predetermined level of vacuum to the EVAP system and monitors the vacuum decay rate. The VCM sets this diagnostic trouble code (DTC) if the vacuum decay rate is more than a predetermined value. The VCM monitors the amount of vacuum and the amount of pressure in the EVAP system by monitoring the fuel tank pressure sensor. For this DTC, the VCM turns ON both the EVAP purge valve and the EVAP vent valve when the Conditions for Running the DTC are met. This applies an engine vacuum to a closed EVAP system. The VCM turns OFF both the EVAP purge valve and the EVAP vent valve when the system reaches a correct amount of vacuum. The EVAP system should quickly RELEASE the vacuum in the EVAP system with the EVAP purge valve OFF and the EVAP vent valve OFF (open). This test indicates a blocked or restricted EVAP vent path if the EVAP system fails to release the vacuum quickly enough.