Silverado P0449 diagnosis.....my attempt to give back. - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 3rd, 16, 02:48 PM Thread Starter
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Matt
 
Join Date: Apr 2013
Location: Michigan
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Silverado P0449 diagnosis.....my attempt to give back.

For all of you following my build thread, you know that I am not a bodyman. I am a mechanic, and recently had trouble with my truck. I'm going to walk through the diagnosis and show a tip that can save a part and some $$. Hopefully I can help you with this the way you all have helped me learn bodywork.

So here is the Amber light on the dash that I hate when it shows up.



And here is the code with the scanner.



This is a pretty common problem with the purge vent valves, and is the same for the trucks, tahoes, suburbans, and their gmc equivalents. The valve is located in front of the gas tank by the charcoal canister on trucks, and behind the bumper on suv's.



Grab some jumpers and connect to 12v source. The valve should click and you can physically see it move. Mine did not.



There are reasons they fail, but without getting long winded one of the reasons is that ethanol attacks the seals which causes them to get dry and stiff causing the valve to stick. Grab some silicon spray lube and spray in the large port.





Try your 12v source agin. It may take some tapping and multiple hits with voltage to get it free. Make it open a few times moving the silicon lube good.

And viola!



This doesn't work every time, but these things are $40 - $80 depending on where you get them. It easy to do so well worth an attempt before just shelling out for a new one.

Hope this helps someone out!

My Build Thread


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post #2 of 5 (permalink) Old Oct 3rd, 16, 03:23 PM
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Scott
 
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Re: Silverado P0449 diagnosis.....my attempt to give back.

Kudos Matt, nice work.

69 Camaro Z/28 RS, original Azure Turquoise, M21 & 3.73 12-bolt posi. NOM 406ci, AFR 210 heads, Straub hyd. roller cam & Dynatech 1-3/4" > 1-7/8" headers, QuickFuel 750 Annular. Photos at:
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post #3 of 5 (permalink) Old Oct 3rd, 16, 03:59 PM
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John
 
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Re: Silverado P0449 diagnosis.....my attempt to give back.

Usually it's just the gas cap for the P0449 code
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post #4 of 5 (permalink) Old Oct 3rd, 16, 04:04 PM
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Re: Silverado P0449 diagnosis.....my attempt to give back.

Nice write-up

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #5 of 5 (permalink) Old Oct 6th, 16, 06:36 PM
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Jeff
 
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Re: Silverado P0449 diagnosis.....my attempt to give back.

I went with part # 25932571 (AC # 214-2149) which is slightly different and has a built in filter instead of the port for that dryer type hose. The electrical hook up is the same and it was around $17 shipped off Ebay. I still have the old one so I might try cleaning it.

Jeff H
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