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Old 11-11-2007
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code PO456

Check engine light came on and i got code PO456, EVAP small leak detection, probable causes
1-defective, loose, or missing fuel cap
2- evap canister broke, hose cracked or not connected
3-purge or vent solenoid defective
4-vacuum leak at engine
is this a common problem? does anyone know what i should check first?
its a 05 edge with the 3.0 and k&n fipk kit on it.....thanks for any help
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Old 11-11-2007
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anyone? pretty please?
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Old 11-11-2007
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If you're sure that the fuel cap is properly seated, the next thing to check is the filler neck hose(s). It says in your profile that you have a 3" body lift and there could easily be an evap leak there that was created when the lift was installed.

A small leak can be very hard to find and could be anywhere from the canister to the tank to the VMV under the hood. Dealers use a pressurized smoke generator tool to locate leaks. This is one of those "Don't try this at home" situations.
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Old 11-11-2007
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well i know the fuel cap is properly seated, ive tightened it over and over, i dont have a body lift, just the fabtech 3" lift, but do you think i should just take it to the dealer and let them handle it?
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Old 11-11-2007
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yeah, evap leaks can suck, lots of parts that could have a leak in them and tryin to detect them without the smoke machine, can suck, and small leaks can still suck even with the smoke machine. its an 05 shouldnt you still be underwarrenty? if you are let them handle it ... if not you can try a diff fuel cap see if that helps, if it doesnt then you know there is a leak somewhere else ...
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Old 11-11-2007
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idk if im under warranty, is it still under warranty if i put the k&n kit on it? and the lift?
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Old 11-11-2007
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Did you have to add an extension to the filler neck for the lift? Or disturb it during the installation. The first thing I would do is check to see if the clamps are tight.
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Old 11-11-2007
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nope, never touched anything around the gas tank, and i put the lift on 15000 miles ago....
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Old 11-18-2007
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my 98 just threw that code as well. it threw the code as I was leaving autozone from picking up something else, what a surprise right? lol. so ya'll would recommend taking it to the dealer then?
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