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post #1 of (permalink) Old 06-09-2016, 03:29 AM Thread Starter
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Another Victim of code P0496

Yesterday morning I cranked up my Impala (2013 with approx. 75,000 miles) and my check engine light was on.I had Advance Auto check the code and it was P0496 Evap. Emission System blah blah.From searching on this forum it appears to be way too common and involves a part behind the LR wheel well liner.I plan on replacing the part myself even though it may be covered under the Emission System warranty.The reason being I dont want the hassle of killing at least a day at a dealer to get it fixed and the warranty info for the Emission System isnt very clear on exactly what it covers.Can anyone suggest where to purchase the part or what brand to get? I have a problem using the OEM ACDelco one as it has lasted such a short time.Thanks for any input.

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post #2 of (permalink) Old 06-09-2016, 03:51 AM
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Yeah, another one of those problems that shouldn't exist. Like you said, it's probably covered under the emissions warranty, but since the part is so cheap and easy to replace (from what I've read) it does kind of make more sense to fix it yourself. I avoid dealerships like the plague anymore!

There is also another part that is related and could also be the cause of the problem - can't remember what it's called off-hand though. From what I've read, the problem can be either part - not sure if there is any way to know for sure which part is the culprit before replacing the parts though. There are a few threads about this topic on the forum - I'll see if I can find them and post links (in case there are any that you haven't seen yet - and for others in the future). Not sure if there is a better chance of fixing the issue by replacing one part over the other though.

It would be nice to get this issue documented a little better for others in the future - please do share anything you learn along the way (how to replace parts, part locations, cost, part numbers, etc).

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post #3 of (permalink) Old 06-09-2016, 04:07 AM
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Here are some links about the issue. Some are specifically for the 2012+, some are for older 8th gens and some just provide some information about the Evap system (which I don't fully understand yet). Just some "light reading" until someone comes back with more specific info... :-)

**Internal Linking (Threads)

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Not sure what's up with the whole "internal linking" thing - must be a side-effect of the updated forum software??

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post #4 of (permalink) Old 06-11-2016, 09:51 AM
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My 2013 threw that code a few months ago and I just had my purge valve replaced. Haven't had a problem ever since.

Do you have any symptoms? When mine was messed up, it would drive just fine except right after I filled the gas tank. It would take a really long time to start when I cranked up the first time.
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post #5 of (permalink) Old 06-11-2016, 10:56 AM Thread Starter
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No,no symptoms.I had filled up last on Sunday and the light came on Wednesday morning when I started to work.I have ordered a replacement from Rock Auto,Standard Motor Products brand.I could not see getting the AC Delco one given how short a time it lasted.
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post #6 of (permalink) Old 06-11-2016, 11:50 AM
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Definitely curious to know if it fixes your issue or not. If you don't mind, can you post the name and part number of the exact item your purchased? Like I said, I know there are a few different parts that can cause this issue. Will be good for future members that have this issue (like me!). :-) Seems to be a poorly designed part for sure... I've NEVER had to replace this part on ANY other car I've owned - even cars with over 200k miles! No way it should be going bad before 100k...

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post #7 of (permalink) Old 06-11-2016, 01:22 PM
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Those of you who get these codes, do you "pack" your gas tank?

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post #8 of (permalink) Old 06-11-2016, 01:35 PM
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I was wondering about that too.... If the amount of gas put into the tank matters. I almost never completely fill my tank (on purpose). I usually keep it between 1/4 and 3/4's of a tank most of the time - mainly to keep the rear end from sagging so much. Not really an issue since I installed the coil-spring boosters, but I still do it out of habit.

Maybe if you consistently "overfill" the tank, it causes this problem to occur sooner than it should? I don't know - just wondering out loud...

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post #9 of (permalink) Old 06-11-2016, 05:13 PM Thread Starter
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I fill mine till the pump shuts off.I wouldn't call that packing.I need to make a correction to my earlier post about no symptoms.I just filled my tank for the first time since the light came on and the car did start but sputtered for several seconds before the idle smoothed out.I will post a link to the part I ordered in another post to this thread.
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post #10 of (permalink) Old 06-11-2016, 05:21 PM Thread Starter
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Here is the part I ordered:


More Information for STANDARD MOTOR PRODUCTS CVS113


It is located behind the LR wheel well and can be accessed from under the car.Looks like fun.lol
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post #11 of (permalink) Old 06-12-2016, 05:10 AM
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Yea that sounds like exactly the problem I was having when my purge valve went.

As to how much gas I put in, I also fill it until the pump shuts off. Never fill past that though.
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post #12 of (permalink) Old 06-15-2016, 12:04 AM
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I usually only put in enough past the auto-shutoff to round up to the next "round" number (nickel/dime) or if I'm going to drive 10+ miles or so right away, maybe the next quarter.

I remember the old days of bouncing the bumper a few times and filling it up almost all the way to the top of the filler neck, haven't done anything like that since I filled up my old pre-catalyst Dart. Just thought there might have been a correlation with the purge valve "sucking liquid" from an overfilled tank after a bit of heat expansion.

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post #13 of (permalink) Old 06-16-2016, 03:51 AM Thread Starter
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Well the new part is on and the code has been reset and no check engine light so far but will need more time to see if the problem was corrected.I watched a few vids (one I will link to below) on this and it looked relatively easy.The thing I did not take into account was the dual exhaust setup on 2012 and up Impalas.The resonator or muffler,not sure which,is somewhat in the way but it can be done.I would suggest raising the car or backing it up onto some ramps to help with working clearances.Another PIA is the electrical connector and how it is released.You have to pull a red tab down then mash a button to release it.I thought just pulling down the tab would do the trick and pried on it and cussed awhile before discovering how it lets go.
After the repair I needed the code reset so I drove to the nearest Advance Auto to ask them to reset it.The counter guy told me they could not reset it but that I could.He came out to the car with the scan tool,plugged it in and then handed it to me and guided me thru the reset process.Apparently its store policy not to reset codes for customers.I find it kind of ironic that they will read your codes,sell you the parts to fix the code(although I did not buy the part from them),but cant reset it for you so you can see if it did indeed fix the issue.I will report back if my problem comes back and here is the link I mentioned earlier.


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post #14 of (permalink) Old 06-23-2016, 03:44 AM Thread Starter
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Update: After installing the part I linked to above and having the code reset it stayed off for about a day then came back on.There is another part of the emmission system that research indicated could also be bad.It is located under the engine cover near the throttle body and is alot easier to replace than the one behind the fender well.I went ahead and purchased this at my local Advance Auto since the cost difference vs. internet pricing wasnt that great plus I wanted to get this fixed before driving the car on a trip next week.I will link to it below.I installed the part this past Saturday but borrowed a co workers code scanner on Monday to reset the code myself.The light has not come back on but from the info on the code reader I found out that some codes are listed as " permanent" until the cars ECM determines thru drive cycles that the issue has been fixed and only then will it be cleared.The P0496 code was listed as permanent on the scanner.I have not tried to read the codes again to see if the ECM has cleared it.Once I have determined the code is gone I will update again.


Dorman - OE Solutions Evaporative Purge Solenoid Valve 911-082: Advance Auto Parts
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post #15 of (permalink) Old 06-23-2016, 04:07 AM
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Thank you very much for the update - this will be very helpful to others in the future!

As to which part is actually the culprit - it seems to be a crap-shoot - I've seen some that find the part is the back was the real problem and others that the part in the front was the real problem. I guess it makes senses to start with the easier one though! :-)

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