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P0455,p0449,p0442 Codes


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#1 chvy1

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Posted 13 November 2008 - 12:21 PM

Does anyone know a solution to this problem? I have a 2006 Z71 5.3 V8 w/53,000 miles and every morning on my way to work I get a message "Tighten Gas Cap". The first two times I got this message I tightened the gas cap but it was already tight. Then my engine light came on and got these 3 codes (P0455,P0442,P0449). I called the dealer and they told me to replace the gas cap and this will solve my problem. Guess what it cleared up for a day. Now I still get the "Tighten Gas Cap" error in the morning and the code is P0455. I checked the lines and the purge valve. Everything looks good. I contacted the dealer again and they said for $300 they will drop the gas tank and change somekind of solenoid. I heard that there was a kit you can buy and this should solve the problem. Did anyone ever have this problem and can I change this myself to avoid the $300 dealer bill?

#2 sledr

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Posted 13 November 2008 - 12:30 PM

Read this......I posted this about a year ago.

http://www.gm-trucks...?...03&hl=sledr

This how I fixed my 442 code. It has been one year now and the "tighten gas cap" message has not returned
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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.
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#3 chvy1

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Posted 13 November 2008 - 01:16 PM

Does anyone know a solution to this problem? I have a 2006 Z71 5.3 V8 w/53,000 miles and every morning on my way to work I get a message "Tighten Gas Cap". The first two times I got this message I tightened the gas cap but it was already tight. Then my engine light came on and got these 3 codes (P0455,P0442,P0449). I called the dealer and they told me to replace the gas cap and this will solve my problem. Guess what it cleared up for a day. Now I still get the "Tighten Gas Cap" error in the morning and the code is P0455. I checked the lines and the purge valve. Everything looks good. I contacted the dealer again and they said for $300 they will drop the gas tank and change somekind of solenoid. I heard that there was a kit you can buy and this should solve the problem. Did anyone ever have this problem and can I change this myself to avoid the $300 dealer bill?



Do you think I need to re run the vent hose on top of the tranny?

#4 lowoh8

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Posted 13 November 2008 - 10:51 PM

tell the dealer u want a new vent valve solenoid, should cost around $110 installed

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#5 jGrenade

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Posted 28 July 2009 - 06:50 PM

Does anyone know a solution to this problem? I have a 2006 Z71 5.3 V8 w/53,000 miles and every morning on my way to work I get a message "Tighten Gas Cap". The first two times I got this message I tightened the gas cap but it was already tight. Then my engine light came on and got these 3 codes (P0455,P0442,P0449). I called the dealer and they told me to replace the gas cap and this will solve my problem. Guess what it cleared up for a day. Now I still get the "Tighten Gas Cap" error in the morning and the code is P0455. I checked the lines and the purge valve. Everything looks good. I contacted the dealer again and they said for $300 they will drop the gas tank and change somekind of solenoid. I heard that there was a kit you can buy and this should solve the problem. Did anyone ever have this problem and can I change this myself to avoid the $300 dealer bill?



Do you think I need to re run the vent hose on top of the tranny?


I'm having the exact same problem, did you find a solution?

#6 jGrenade

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Posted 27 December 2009 - 11:07 AM

Does anyone know a solution to this problem? I have a 2006 Z71 5.3 V8 w/53,000 miles and every morning on my way to work I get a message "Tighten Gas Cap". The first two times I got this message I tightened the gas cap but it was already tight. Then my engine light came on and got these 3 codes (P0455,P0442,P0449). I called the dealer and they told me to replace the gas cap and this will solve my problem. Guess what it cleared up for a day. Now I still get the "Tighten Gas Cap" error in the morning and the code is P0455. I checked the lines and the purge valve. Everything looks good. I contacted the dealer again and they said for $300 they will drop the gas tank and change somekind of solenoid. I heard that there was a kit you can buy and this should solve the problem. Did anyone ever have this problem and can I change this myself to avoid the $300 dealer bill?



Do you think I need to re run the vent hose on top of the tranny?


I'm having the exact same problem, did you find a solution?



Ended up taking it to the dealer. They said the "evaporative e-valve" was burned up. Ended up costing me $900 bucks. Truck only had 36k miles.

Edited by jGrenade, 27 December 2009 - 11:09 AM.


#7 Rudy35

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Posted 27 December 2009 - 11:23 AM

The dealerships are charging way too much. When I got the "tighten gas cap" code, it was the vent valve selonoid that was bad. GM wanted over a hundred bucks just in parts for the updated one so that the vent could be relocated above the transmission. I just went to RockAuto.com and bought the originial vent valve selonoid for $17. This fixed the code problem. My original valve lasted 5 years without the vent above the transmission, so for $17 I hope to get another 5 years. I also bought another $17 valve to have on the shelf for next time. Cheaper than what the dealership will charge!
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#8 desrtrat

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Posted 27 December 2009 - 08:12 PM

Does anyone know a solution to this problem? I have a 2006 Z71 5.3 V8 w/53,000 miles and every morning on my way to work I get a message "Tighten Gas Cap". The first two times I got this message I tightened the gas cap but it was already tight. Then my engine light came on and got these 3 codes (P0455,P0442,P0449). I called the dealer and they told me to replace the gas cap and this will solve my problem. Guess what it cleared up for a day. Now I still get the "Tighten Gas Cap" error in the morning and the code is P0455. I checked the lines and the purge valve. Everything looks good. I contacted the dealer again and they said for $300 they will drop the gas tank and change somekind of solenoid. I heard that there was a kit you can buy and this should solve the problem. Did anyone ever have this problem and can I change this myself to avoid the $300 dealer bill?



Do you think I need to re run the vent hose on top of the tranny?


I'm having the exact same problem, did you find a solution?



Ended up taking it to the dealer. They said the "evaporative e-valve" was burned up. Ended up costing me $900 bucks. Truck only had 36k miles.

i may be wrong but, that should of been covered under FEDERAL emission warranty 7yr/70k mi..




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