You can see physical location and the procedure how to replace purge valve solenoid in GMC Envoy on: https://www.youtube.com/watch?v=Y9C8nR6iv7A
Procedure:
DTC P0496 - Evaporative Emission (EVAP) System Flow During Non-Purge
If the EVAP purge valve does not seal properly, fuel vapors could enter the engine at an undesired timing causing drivability concerns. The control module tests for this by commanding the EVAP purge valve OFF closed and vent valve ON closed, sealing the system, and monitoring the FTP for an increase in vacuum. If the control module detects that Evap system vacuum increases above a calibrated value, DTC P0496 will be set.
This could be a sign that your purge valve is intermittently failing so you might want to get it checked out before it turns into a bigger problem that affects the drivability of your truck.
EVAP is located behind the throttle body, near the front of the engine...
Fig. Front engine compartment view-4.8L, 5.3L, 6.0L and 6.2L engines (1) Throttle Body (2) Manifold Absolute Pressure (MAP) Sensor (3) Evaporative Emission (EVAP) Canister Purge Solenoid Valve (4) Knock Sensor (KS) (5) Engine Block Heater (6) Engine Coolant Temperature (ECT) Sensor (7) Camshaft Position (CMP) Sensor (8) Generator
The first step would be to simply clean the valve and see if that helps. The purge valve will be an inexpensive part (probably $20.00 or so) so I'd usually just replace it instead of trying to test it too thoroughly. I've found it can be a somewhat tough part to come by third party dealers (Napa, Autozone, etc.) So you might have to contact your local GMC dealership parts department to buy the part.
The best thing to do would be to ask the person at the repair dept who sells you the part to copy the page with the replacement guidelines from the service manual. You usually won't have any trouble getting them to do this and then you'll have a good written copy to follow while you change the valve.
The other option would be to have a local mechanic do the replacement for you.
Hope it helps...
P0496 code Purge Valve Test Replacement 2008 GMC Envoy
SOURCE: I HAVE A 2007 GMC
DTC P0496 - Evaporative Emission (EVAP) System Flow During Non-Purge
If the EVAP purge valve does not seal properly, fuel vapors could
enter the engine at an undesired timing causing drivability concerns.
The control module tests for this by commanding the EVAP purge valve OFF
closed and vent valve ON closed, sealing the system, and monitoring the
FTP for an increase in vacuum. If the control module detects that Evap
system vacuum increases above a calibrated value, DTC P0496 will be set.
This could be a sign that your purge valve is intermittently failing
so you might want to get it checked out before it turns into a bigger
problem that affects the drivability of your truck.
EVAP is located behind the throttle body, near the front of the engine...
Fig. Front engine compartment view-4.8L, 5.3L, 6.0L and 6.2L
engines (1) Throttle Body (2) Manifold Absolute Pressure (MAP) Sensor
(3) Evaporative Emission (EVAP) Canister Purge Solenoid Valve (4) Knock
Sensor (KS) (5) Engine Block Heater (6) Engine Coolant Temperature (ECT)
Sensor (7) Camshaft Position (CMP) Sensor (8) Generator (click for zoom)
The first step would be to simply clean the valve and see if that helps.
The purge valve will be an inexpensive part (probably $20.00 or so) so
I'd usually just replace it instead of trying to test it to thoroughly.
I've found it can be a somewhat tough part to come by a third party
dealers (Napa, Autozone, etc.) So you might have to contact your local
GMC dealership parts department to buy the part.
The best thing to do would be to ask the person at the repair dept
who sells you the part to copy the page with the replacement guidelines
from the service manual. You usually won't have any trouble getting them
to do this and then you'll have a good written copy to follow while you
change the valve.
The other option would be to have a local mechanic do the replacement for you.
Hope helps.
SOURCE: 2005 GMC Envoy Locked in 4WD all the time
If your luck it's going to be a $15.00 vacuum switch on the transfer case that takes about 15 min to replace, if it's the electronic solenoid to the transfer case then it's going to be cost a little more and take a little longer. If your try switching from 4WD to 2WD and hear the solenoid working by hearing the cluck's when it engages and disengage then it's going to be the vacuum switch on top of the transfer case on the drivers side. Auto Zone Sell's them for $15.00 and they will have the step by step instructions to replacing the switch. They will also have the transfer case solenoid too, if you don't hear the solenoid. Check the fuses, the fuse may have gone bad. Good luck and hope this helps.
SOURCE: how do i change the shift solenoid on a gmc envoy
The sift solenoids are located on the valve body inside the transmission.
The transmission pan has to be removed to gain access the the valve body. Once the pan is removed the valve body is in plain sight.
Removal of the transmission filter will grant you a clearer view as well.
This is a 4L60E transmission, in the event you have not purchased the solenoids.
SOURCE: 2006 gmc sierra 1500 4.3 . check engine light on.
More than likely the evaporator vent valve.
2.2.
Push down, while pulling up slightly in order the disengage the tube.
Disconnect the EVAP canister purge solenoid electrical connector (1).
Remove the EVAP canister purge solenoid bolt (2). Remove the EVAP canister purge solenoid (3) and insulator (1).
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