Question about 2003 Hummer H2

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What does diagnostic code PO455

The engine light came on and what does diagnostic code PO455 mean?

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  • Anonymous Mar 13, 2014

    what does this code mean po455

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  • Contributor
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A code p0455 most likely means one or more of the following has happened:

  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system

With a p0455, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary.

Posted on Sep 29, 2009

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  • Hummer Master
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Evap emission control system leak large check gas cap for seal if good check gas lines for damage also smell around for gas vapor

Posted on Sep 29, 2009

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I currently have the same code on my H2. My problem was that this big truck has a cheap plastic fuel tank. The seam in the middle of the fuel tank where they put the top and bottom together has a huge crack at the seam. So for me the code means I need a new fuel tank.
Why in gods name would they put a cheap plastic fuel tank on a tank???

Posted on Feb 14, 2010

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Posted on Jan 02, 2017

  • 973 Answers

SOURCE: diagnostic codes

http://www.obd-codes.com/p0442
http://www.obd-codes.com/p0455

Click on the links above to help you.

Posted on May 27, 2010

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1 Answer

What does the code PO455 mean?


PO455 Evap System Gross Leak

The old days left in 1981 some 32 years ago

You really have to smoke test the Evap System to
find hose leaks & use a scan tool to actuate the solenoids
to check for bad ones

Without a system diagram your pretty much lost

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Check engine light came on and the code showed po455


its a evap code could be from a bad gas cap to a cracked vapor line or a bad sensor

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There is a pretty good emissions leak somewhere.

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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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po442 is evap emission control system leak (small) 1 of the lines for emissions is leaking. po455 is-- emission control system leak (large). turn off light with code scanner after it is fixed.

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"po455 large leak" means that you are not maintaining positive pressure in your fuel system. Have a mechanic do a "smoke test" on the fuel system. Could be as simple as a loose gas cap...

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Is your gas cap tight? check it, these codes indicate a large leak in the fuel evaporative emission recovery system at the gas tank

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hi !the three codes po353,351 and355 refer to the ignition coil po455 refers to evap emission control leak [LARGE} HOPE THIS HELPS

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