P0456 Code, Small Evap Leak FIXED
JK Jedi
Joined: Jun 2013
Posts: 11,353
Likes: 2,088
From: Willow Park, TX
Dealing with this dumb code myself now on my '13.....it happens just from time to time....usually with a good length of time in between. Just enough to be annoying. Time to start inspecting the list of culprits....ugh.
JK Newbie
Joined: Jan 2009
Posts: 72
Likes: 0
From: Grand Junction, CO
Start with a new oem gas cap. Then integrity module o ring, then replace integrity module, then purge valve, then maybe evap canister if physical damage is shown to the unit.
Check evap plastic lines that are next to the battery. They sometimes rub.
My theory on this after pulling my hair out is that not many people actually have a leak in the lines. It always comes down to those units specifically the o-ring not making a tight seal. You could play parts roulette with it for the same price as a smoke test or buying the kit from harbor freight to do your own.
Check evap plastic lines that are next to the battery. They sometimes rub.
My theory on this after pulling my hair out is that not many people actually have a leak in the lines. It always comes down to those units specifically the o-ring not making a tight seal. You could play parts roulette with it for the same price as a smoke test or buying the kit from harbor freight to do your own.
JK Enthusiast
Joined: Dec 2007
Posts: 307
Likes: 0
From: Vancouver, WA
P0456
I had to go QUICKLY from ON to ACC 3 times to get the code. Felt around below the battery, and sure enough I felt a rough spot. I taped it twice. Turned the key to ON and STILL had the check engine light. Reading more of these posts, I found that you must RESET the computer and clear it, by disconnecting the negative terminal. Did that and NO MORE CHECK ENGINE LIGHT.
Thanks everyone.
Thanks everyone.
JK Newbie
Joined: Jan 2009
Posts: 72
Likes: 0
From: Grand Junction, CO
Electrical taping every single tube I could find close to the battery under the hood & buying a new gas cap did not solve the problem. Buying these from quadratec solved my problem.
1 51315 0001 MOPAR EVAP INTERGRITY MOD DETECTOR JK 4861962AA 31.00
1 51315 0002 MOPAR VAPOR CANNISTER SEAL JK 52129436AA 5.00
1 51315 0001 MOPAR EVAP INTERGRITY MOD DETECTOR JK 4861962AA 31.00
1 51315 0002 MOPAR VAPOR CANNISTER SEAL JK 52129436AA 5.00
JK Newbie
Joined: Jan 2009
Posts: 72
Likes: 0
From: Grand Junction, CO
Sorry I should have been more specific. I can't get the black hosing off the nipple coming off the module. Yes the other side is 1/4 turn with a tab pushed. I got the hose end off by squirting some water on the hosing which is hard and
suffering from the dehydration.
suffering from the dehydration.
Last edited by grandjunktion; Apr 10, 2018 at 03:05 PM. Reason: Adding on...
JK Newbie
Joined: Sep 2018
Posts: 1
Likes: 0
From: Bagley mn
Exact
When my extended warranty was about to expire, I took the Jeep (2013 JK Sport Base) to the stealership to have an 87 point inspection. Other than brake pads, the Jeep passed with flying colours. 2 weeks and nearly 1000 Km later (yes, I drive that much), I got the CEL this morning when I started the Jeep.
Didn't have time to check the code, so I went for my assignment and one hour later my reader told me it was a P0456.
I noticed something else:
1. The engine didn't quite sound like it used too, it may be just me but I spend half of my life in that Jeep. Can't tell what the difference is, but is just different.
2. ECO ON won't activate. You may not use the ECO ON feature on the Odometer. It normally reads ECO when you're driving "normally", and ECO ON when you're driving like an old lady. I do my best to keep that thing at ECO ON, not really hard once you get used to it. As long as you have the appropriate gear, it should read ECO ON when you're under 2000-2100 rpm. If you're coasting downhill most definitely you'll get ECO ON. Well, I'm not getting it even when coasting at 60 Kph+. But my OBDC reader still indicates that my fuel efficiency is 0 L x 100 Km (about infinite miles per gallon) when coasting down the hill.
I did a quick visual on the lines by the battery and the gas cap seal and they look good to me.
Got to check again and probably hard-reset the code.
Didn't have time to check the code, so I went for my assignment and one hour later my reader told me it was a P0456.
I noticed something else:
1. The engine didn't quite sound like it used too, it may be just me but I spend half of my life in that Jeep. Can't tell what the difference is, but is just different.
2. ECO ON won't activate. You may not use the ECO ON feature on the Odometer. It normally reads ECO when you're driving "normally", and ECO ON when you're driving like an old lady. I do my best to keep that thing at ECO ON, not really hard once you get used to it. As long as you have the appropriate gear, it should read ECO ON when you're under 2000-2100 rpm. If you're coasting downhill most definitely you'll get ECO ON. Well, I'm not getting it even when coasting at 60 Kph+. But my OBDC reader still indicates that my fuel efficiency is 0 L x 100 Km (about infinite miles per gallon) when coasting down the hill.
I did a quick visual on the lines by the battery and the gas cap seal and they look good to me.
Got to check again and probably hard-reset the code.