DTC - p0449 & p0440 HELP !!!!
Posted 27 November 2006 - 05:32 PM
Posted 27 November 2006 - 05:43 PM
Whoever told you the vent solenoid is part of the pump is smoking something really good. The vent solenoid is a totally separate entity and you need to speak to a parts department that knows what the hell they're doing. Either that or you're giving them some misinformation, which might be the case since other places are telling you the same thing.
The P0449 *may* be due to a bad vent solenoid, but it's possible it's a wiring issue. Most likely culprit is the solenoid and if the solenoid is stuck open, you're gonna get the P0440. Pay no attention to the time period needed for the codes to set.
Who told you the capacity of your tank is 22 gals? Short bed capacity is 26 gals. and long bed is 34 gals.
Posted 27 November 2006 - 06:06 PM
Discount Auto Parts said it was a 22 gal tank a while ago.. thanks for clearifying. i knew that couldnt be correct.
Posted 27 November 2006 - 06:31 PM
The vent valve should be OPEN to flow when there is no power/ground applied to it. With the key ON, there should be power to the pink wire. The PCM then grounds the white wire as necessary to turn on the solenoid. You could try using an external ground on the white wire when the key's on to see if the solenoid clicks. They usually don't fail electrically but just get full of crud and fail to seal.
Whether or not the vent valve is working, it should not affect the way the engine runs. A stuck open purge valve possibly but not the vent valve.
Posted 28 November 2006 - 02:33 AM
Posted 28 November 2006 - 09:42 AM
the code p0440 would indicate a faulty purge valve
Where exactly are you getting that information from? Wherever it was, it's mostly wrong. While it may be possible, it is extremely unlikely. A failed purge valve could set a P0440 but you would have purge valve codes along with the P0440. I personally have never seen a purge valve cause a P0440, even when they've failed and are being replaced for other reasons.
A P0440 is a large leak. This could be caused by a vent valve that is not closing/sealing when it should, preventing the system from drawing and holding a vacuum and passing the test. Obviously, it could be caused by genuine leaks in the system (such as something as simple as a gas cap that doesn't seal), but you need special equipment to test for this.
I say replace the evap vent valve and go from there or take it somewhere that can do the proper tests to determine the cause.
Posted 28 November 2006 - 08:32 PM
Posted 28 November 2006 - 08:44 PM
Last night I got the DIC message again and a few minutes later the SES light cam on once again. The light remained on this morning but on my return trip home it turned off - no light. Do I have a bad gas cap as well as an evap canister???
Edited by sledr, 28 November 2006 - 08:45 PM.
2004 Chevrolet Silverado LS SBEC Z71 Black w/ Dark Pewter interior, 5.3, 3.73 /w/locking diff, 1SE option package, trailer towing package, hood deflector, mudflaps, bedliner, tonneau cover, Dueler A/T Revos.
2006 Triton LT-10 Enclosed
2006 Ski-Doo MXZ 600 SDI Adrenaline
Posted 22 September 2008 - 08:05 PM
Posted 03 March 2013 - 04:52 PM
Hello, I have a 2005 Chevy Silverado 5.3l V-8 and have the P0449 code. I was wondering if anybody had a good part # for the Evaporative Emission Control System Vent Valve and Solenoid. I am stationed in cuba and have very little resources down here to get the correct part #'s. Please help.
I found the part on amazon dot com. Ac delco 214-1105 Valve Assembly took me about 2 minutes to install and got rid of DTC p0449.... the cost was about $19 plus shipping
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