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Thread: Need Help...Emissions System Leak??

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    Junior Member the_expo7's Avatar
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    Question Need Help...Emissions System Leak??

    A few months ago my check engine light came on on my 04' Rubicon. I had it diagnosed at Checkers and it said "code P0456 Evaporative Emissions System Leak Detected (very small leak)". The guy who worked there said it was a common problem with the fuel cap either not being on correctly or tight enough, or that it was defective. I turned the fuel cap tighter and the check engine light went off. Now it has happened again with same diagnostic reading. Turning the cap tighter did not work this time, so I bought a new fuel cap. This failed to solve the problem, and it is on there nice and snug now. Anybody have anything like this on their jeep, or know about this problem? Any help would be great. Thanks
    Last edited by the_expo7; 08-20-2009 at 13:05.

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    Land Squid Jeffb_79's Avatar
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    Did you reset the code, or are you just waiting for the light to go off? It can take a while for the code to shut off on it's own some times.

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    Junior Member the_expo7's Avatar
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    Quote Originally Posted by Jeffb_79 View Post
    Did you reset the code, or are you just waiting for the light to go off? It can take a while for the code to shut off on it's own some times.
    I have not reset the code. I don't know how to do that...just figured it would go out.

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    Land Squid Jeffb_79's Avatar
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    You can do 2 things.... go to autozone, have them scan and then reset the code.
    Or go out side and unplug your battery for a few hours.

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    Junior Member the_expo7's Avatar
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    Quote Originally Posted by Jeffb_79 View Post
    You can do 2 things.... go to autozone, have them scan and then reset the code.
    Or go out side and unplug your battery for a few hours.
    Ok. I disconnected the battery for a few and left the headlights on to drain remainder of power. Reconnected and started it back up. No check engine light. Guess the new fuel cap was what I needed and just had to clear the code out. Appreciate your help man.

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    Land Squid Jeffb_79's Avatar
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    It takes a while for the code to re-appear if you're still throwing it. I would say if you don't see it in 500 miles you should be good to go.

  7. #7
    Back to 1 Jeep... for now rroadkilll's Avatar
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    I still have this code!!!

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    darwinism at its best irish1371's Avatar
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    if memory serves the evap can is under the hood on the drivers fenderwell. I believe I have followed literally 100's of threads like yours and it is usually a gas cap or the evap can has a loose/split hose at the canister.

    I would check the vacuum hoses going to the canister very carefully. they seem to back off or crack alot and cause this code to show.

    hope this helps
    "Some people wonder their whole lives if they will ever make a difference. Marines don't have that problem." Pres. Ronald Reagan
    Army vs Marines = http://www.youtube.com/watch?v=_2M7ckkxQLU

  9. #9
    Back to 1 Jeep... for now rroadkilll's Avatar
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    Does it matter how the canister is sitting???

    I had to move mine when I did the "high-line" fenders...

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    Land Squid Jeffb_79's Avatar
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    It shouldn't matter as long as the hoses are connected and not leaking.

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