P0456 Concers


#1

Hello everyone, my Jeep recently came up with a CEL after pumping gas sometime last week. It happened about an hour after so I did some research and they said one solution could be that my gas cap may be lose or needs replacement. I then removed and made sure the cap was secured properly. After about two days the CEL stopped showing up. I just took my Jeep to an AutoZone and was told that the reader was still detecting the issue. Should I be worried??? Any help would be appreciated


#2

No.

It just means the readiness monitors for the EVAP system haven’t reset.

Drive the vehicle normally, and the readiness monitors for the EVAP system should reset.

Tester


#3

fyi, here’s how the Chrysler evap systems work. Jeep is a division of Chrysler, right?

http://www.agcoauto.com/content/news/p2_articleid/295


#4

Thanks for the quick responses. I’ll update once I’ve checked the link provided.


#5

If I understand this correctly; the check engine light is no longer on but the scan tool showed a stored fault.

The fault will remain in the computers memory for 255 ignition cycles or until erased with a scan tool or battery disconnect. Forget about it if the light remains off.


#6

You are correct. After I pumped gas a second time and made sure to properly secure the gas cap the CEL went away after a day or so. I then went to the AutoZone afterwards and was told it was still reading the issue. I will get it erased since I haven’t had a CEL show up in the past week. Thank you all for your help.


#7

Autozone wanted you to buy a gas cap.


#8

The guy didn’t offer one to me. He printed out my diag. I thanked him and left.


#9

@FuMZ

your gas cap . . . what condition is the seal in?

Nice and pliable?

Cracked and/or chunks missing?


#10

Not cracked or chunks missing. It is however odd to seal it. Seems like even when I hear it click when I tighten it that it doesn’t even lock properly. I just thought the cap was very basic/cheap