# P0456 Concers **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [April 17, 2016, 3:26am UTC](https://community.cartalk.com/t/p0456-concers/93053 "2016-04-17T03:26:33Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![FuMZ](https://avatars.discourse-cdn.com/v4/letter/f/a3d4f5/32.png) [@FuMZ](https://community.cartalk.com/u/FuMZ)\ **Post date:** [April 17, 2016, 3:26am UTC](https://community.cartalk.com/t/p0456-concers/93053/1 "2016-04-17T03:26:33Z")
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 ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [April 17, 2016, 3:37am UTC](https://community.cartalk.com/t/p0456-concers/93053/2 "2016-04-17T03:37:47Z")
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 ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [April 17, 2016, 3:59am UTC](https://community.cartalk.com/t/p0456-concers/93053/3 "2016-04-17T03:59:27Z")
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](http://www.agcoauto.com/content/news/p2_articleid/295) ---
**Author:** ![FuMZ](https://avatars.discourse-cdn.com/v4/letter/f/a3d4f5/32.png) [@FuMZ](https://community.cartalk.com/u/FuMZ)\ **Post date:** [April 17, 2016, 5:02am UTC](https://community.cartalk.com/t/p0456-concers/93053/4 "2016-04-17T05:02:21Z")
Thanks for the quick responses. I’ll update once I’ve checked the link provided. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [April 17, 2016, 6:06am UTC](https://community.cartalk.com/t/p0456-concers/93053/5 "2016-04-17T06:06:08Z")
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. ---
**Author:** ![FuMZ](https://avatars.discourse-cdn.com/v4/letter/f/a3d4f5/32.png) [@FuMZ](https://community.cartalk.com/u/FuMZ)\ **Post date:** [April 17, 2016, 10:41am UTC](https://community.cartalk.com/t/p0456-concers/93053/6 "2016-04-17T10:41:24Z")
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. ---
**Author:** ![skulldrinker](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/skulldrinker/32/3215_2.png) [@skulldrinker](https://community.cartalk.com/u/skulldrinker)\ **Post date:** [April 17, 2016, 12:35pm UTC](https://community.cartalk.com/t/p0456-concers/93053/7 "2016-04-17T12:35:17Z")
Autozone wanted you to buy a gas cap. ---
**Author:** ![FuMZ](https://avatars.discourse-cdn.com/v4/letter/f/a3d4f5/32.png) [@FuMZ](https://community.cartalk.com/u/FuMZ)\ **Post date:** [April 17, 2016, 12:41pm UTC](https://community.cartalk.com/t/p0456-concers/93053/8 "2016-04-17T12:41:46Z")
The guy didn’t offer one to me. He printed out my diag. I thanked him and left. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [April 17, 2016, 11:27pm UTC](https://community.cartalk.com/t/p0456-concers/93053/9 "2016-04-17T23:27:16Z")
@FuMZ your gas cap . . . what condition is the seal in? Nice and pliable? Cracked and/or chunks missing? ---
**Author:** ![FuMZ](https://avatars.discourse-cdn.com/v4/letter/f/a3d4f5/32.png) [@FuMZ](https://community.cartalk.com/u/FuMZ)\ **Post date:** [April 18, 2016, 7:21am UTC](https://community.cartalk.com/t/p0456-concers/93053/10 "2016-04-18T07:21:58Z")
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