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Old 12-07-2011, 06:54 PM
CF Beginner
Join Date: Dec 2011
Posts: 2
Default Help with ,p0442,p0449 & p0455 silverado

Hi, I'm new to the website. I have a Chevy Silverado Classic 07 4.3 and it has 48,xxx Miles on it. I recently when i was driving i got message on my DIC (tighten gas cap) i stopped and tighten it. later the next day i had the engine light come on (it annoys me to have that engine light )
Well i took it to auto zone and got the code read and got p0455( she said gas cap) so i bought a new one ( put it on ) and then reset the code. Then later the next day i had the engine light come again. I went it took it back and got to rescan and got 3 codes p0442,p0449 & p0455 (im like wahhhah!! ) i dont know what else to do...any had any problems with this?
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Old 12-07-2011, 11:35 PM
CF Veteran
Join Date: Mar 2011
Posts: 1,706

They programmed the "TIGHTEN FUEL CAP" warning into the DIC because that's the most common reason for an air leak in the EVAP system in these days of self service gas. It's possible that the leak is actually not through the fill cap. If a visual inspection or smell doesn't turn up anything, consider taking it in for service.
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Old 12-08-2011, 02:23 PM
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Join Date: Dec 2011
Posts: 2

I already change,the cap but,i,think is,the,vent solenoid is,very,typical with,this,trucks
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Old 12-10-2011, 10:40 PM
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Join Date: Dec 2011
Location: Rosamond CA
Posts: 13

Vent solenoid is a good candidate.
The dealer will charge a lot to replace this part.

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Old 12-11-2011, 02:53 PM
CF Junior Member
Join Date: Jul 2011
Location: ON Canada
Posts: 96

yes, VENT SOLENOID under the truck... is attached to charcol canister and located on fuel tank. There is an update for it.
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