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Old 03-27-2013, 09:26 PM   #1
Join Date: Mar 2013
Posts: 3
P 0456

I have a check engine light that shows code p 0456. Small leak in evap system. I have already replaced the gas cap. Anyone have an idea where I should start looking next?

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Old 03-27-2013, 09:32 PM   #2
Join Date: Feb 2013
Posts: 39
without proper tools its tough...could be leaking from a vent control valve, or the evap system itself. without being able to pressurize the system its tough to diagnose

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Old 03-27-2013, 09:35 PM   #3
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Join Date: Jun 2012
Posts: 353
That is one of those codes that is stupid in my mind and nearly impossible to chase. I hope your state doesnt have emissions testing. I have heard of people selling their vehicles because they gave up on chasing that code. As much as I hate saying it, I would take it to the stealership and have them do the diagonsis. Edit. Did you check to make sure when you changed your gas cap that there is no corrosion or rust built up on the sealing surface at the filler?
2005 TJ with a few goodies
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Old 03-27-2013, 10:07 PM   #4
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Join Date: Aug 2012
Location: La Crescenta, CA
Posts: 1,260
After you change the gas cap it takes about 3 full trips before the computer can determine that the leak is gone. If the code doesnt disappear after a couple trips on its own then it wont be the gas cap. Maybe a EVAP hose ruptured/cracked and has a small leak? Best way to find it is a smoke test, a mechanic with the machine or the stealership should be able to diagnose it.

I had the same problem until I changed the gas cap!
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