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I have error codes PO454, PO455, PO449. the check engine lith is on

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Posted on Jan 02, 2017

motor1258
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SOURCE: error codes po454 and po455. What do I have to do

Any chance it occurred soon after filling up or adding fuel. ? Start by removing gas cap, cleaning the seal good on it, as well as threads and surface where cap seals in filler neck. Quite often it's just a bad/loose seal at gas cap. If that doesn't do it, you may need to replace cap, but check all your vacuum lines etc, just in case, if cleaning and making sure cap is tight doesn't do it.

Posted on Dec 31, 2009

junkman1249
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SOURCE: 2005 chevy Z71 check engine code PO449 and PO455 5.3 Lt engine how do i fix them

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

Posted on Dec 07, 2011

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My check engine light is on in my 2008 GMC SIERRA 1500 pickup with 5.3 V8 I have 2 fault codes, PO449 & PO455. I tried removing battery cable no help. Can anyone steer me in righ direction. Thanks


First check the tightness of your gas filler cap as this can cause the codes to set. To erase the codes you will need a scan tool or code reader . Check the wiring and connections for the EVAP vent solenoid . Fuel tank pressure sensor may be bad .

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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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My 2003 chevy silverado 1500 4wd (5.3 Vortec) has a trouble code (po449 & 455) I know what that problem is but, I do not know where the locations of this problem would be. PO449 is a Evaporative...


The first thing I would check is the fuel cap. Your vehicle uses a closed vent system to control the fuel vapors in the tank and then vent the vapors to the engine intake system to burn. so you have a leak either your purge/ vent solenoid is stuck or open all the time not allowing the on board diagnostics to run the test or you may a bad fuel cap, and it is venting to the atmosphere allowing the gross leak. The purge/ vent valve is under the vehicle next to the charcoal canister.

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Any chance it occurred soon after filling up or adding fuel. ? Start by removing gas cap, cleaning the seal good on it, as well as threads and surface where cap seals in filler neck. Quite often it's just a bad/loose seal at gas cap. If that doesn't do it, you may need to replace cap, but check all your vacuum lines etc, just in case, if cleaning and making sure cap is tight doesn't do it.

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