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Codes P0256 & Gas cap, Again.

489 views 1 reply 2 participants last post by  Old Dogger  
#1 ·
I have a 2010 Rubicon JK, and I've been getting the above codes on my Jeep.
I'm 76 and I've crawled around and looked at everything, no leaks. I finally bought a smoke machine, and tried it out yesterday, the only place there was any smoke was from the oil fill cap? I reset the PCM, and so far, everything is just peachy. BTW I put an O ring on the oil cap, no more smoke. Could the missing O ring on the cap have been the Problem?