Question about 2004 Chevrolet Impala

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My 2004 chevy impala has a engine code of PO455 and i changed the gas cap but i keep getting the code back. any thing else i should check?

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Sometimes the recirc line fitting can be cracked or worked loose and allow the same pressure loss. On the Impala I am not exactly sure how to get to them.

Posted on May 07, 2010

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I have 2006 chevy equinox code po455 I change the fuel cap and the purge evap valve but my code comes back what else could it be?


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I have po455 in this car


First thing I would try is, buy the correct gas cap, install it and reset the code. Drive it for a few days and see if the code comes back. Your car is 10 years old, so I suspect a worn seal on your current gas cap.

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Po455 trouble code


It is a leak in the fuel evap system. This can be caused by a loose gas cap. If the cap is not loose then there is a leak in the system. That model Impala is known for the return solenoid going bad. It is located by the gas filler. They run about $40. I have included a link from a forum that may help you if you are mechanically inclined.
http://www.impalaforums.com/chevy-impala-8th-gen-discussion/121840-2006-impala-3lt-p0455-large-evap-leak.html

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get a new gas cap your evap sytem isnt working if the gas cap doesnt work then you might have a leak and check your EVAP purge valaves

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I have a chevy Impala and the check engine light is on does that mean the engine about to go


noooooo you probably have a bad sensor or as easy as a gas cap will trip the light

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My 2004 chevy monte carlo has a engine code of PO455


From Answers.com

Large vapor leak in the evaporative emmisions system

Read more: http://wiki.answers.com/Q/What_is_code_P0455#ixzz17Y9zrN00

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06 chevy impala v6 3.9 liter engine. Check engine


there is a large evaporative leak. keep away form ottozoo, they dont have the brain power to actually diagnose a light bulb., their job is to sell parts., if they sell you the wrong parts tough.Take it to a qualified repair shop that does a lot of GM work or the dealer.

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1 Answer

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It will not go off by itself,you will need to reset it by connecting to a diagnostic tool.Once cleared if there is any other problem then it will trigger the check engine light again.Hope this helps..

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I had a check engine light on for my gas cap. I fueled up and sometimes it would say "check gas cap" So i just plugged it in under the steering wheel and cleared the check engine light from my dash board. So far so good.

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