Enclave P0496 Code

Oh, the dreaded Check Engine Light!  There is nothing worse that can happen to my wife’s car than a big bright Check Engine Light!  That thing comes on and it’s time to buy a new car.  Since I do not like car payments I don’t really think that is a viable option, check out this post to learn why!  This needs to be fixed right away!

Ahhhhh! CEL!!!!

As soon as my wife told me about the light, I immediately got my trusty Actron scan tool and pulled the code.  The code was P0496 which indicates and EVAP error.  Some quick googling and I found it to be an EVAP error.  I thought to myself, oh no, not again!  Another GM car with an EVAP system I will be unable to fix

However, I found that this points directly to the High Pressure Purge Valve.  In my case I tested the valve and with my first test found it to be faulty.  The test I performed was to blow straight through it, if you can feel air on the other side, it is faulty.  The default state is closed so you should not be able to blow air through it.

This is how you replace that High Pressure Purge Valve.

You will need to remove the oil fill cap so that you can pull off the plastic cover.

Remove the plastic cover and replace the oil cap to prevent any debris from entering the engine.

Replace the Cap!

The High Pressure Purge Valve is located under that cover.  The location is below.

Remove the EVAP hose from the High Pressure Purge Valve.  Do this by pushing down on the green tab and pulling the hose off.

Remove the electrical connector from the High Pressure Purge Valve as well.  Just push down on the tab and pull it off.  This was not an issue at all for me.

There is a 10mm bolt that is holding the High Pressure Purge Valve in place.  Remove the bolt and pull out the High Pressure Purge Valve.  There is a gasket on the end that may give you an issue, but it will pull out with a little persuasion.

After pulling out the High Pressure Purge Valve, you can start testing it.  Blow through the valve and see if air goes through.  If it does, the valve is stuck open and will need to be replaced.  At this point, I knew what my problem was, but if you don’t get air through, there is another test you can run.  You can supply power to the electrical connector to see if the valve opens.  I did not have to do this, but just supply a ground and a 12V source to see if it opens.  If it does not, it is faulty and will need to be replaced.  If it does open, your problem most likely lies elsewhere.

Replacement is the exact opposite of the removal.  You just push the High Pressure Purge Valve into the side of the intake manifold, tighten up the bolt, and reattach the hose and electrical connector.

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