Why is there no recall or class action suit for the EVAP system problems?

I've had 4 JK's and haven't heard of it either. What problems are you having?

I personally do not allow my JK or anyone in it to vape. As a former smoker of over 30 years, I quit about 10 years ago and I'm fortunate my lungs show no signs of damage and I'm healthy. As far as I'm concerned, vaping is a stupid habit and a nothing but a money-grab for those ridiculous pop-up shops that attract all sorts of whack-jobs. Just fugging quit.

oh...... wait..... I though you said...

I haven't heard of any problems. Not saying that there not an issue out there I just haven't read about it

https://www.700r4transmissionhq.com/p0456-jeep-wrangler/

One of the most common trouble codes with the Jeep Wrangler is the P0456 code. This trouble code references a number that is given to you when you plug your Wrangler into a OBDII scanner. P0456 Indicates that there is a small leak in the evaporative emission control system. It often appears with, or is related other codes, such as P0420, P0441, and very often P0440.

P0456 is normally not an immediate threat to the drive-ability of your Wrangler. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible.

While the trouble code may state that there is a “small leak” in the EVAP system of your Jeep Wrangler, it is actually referring to the amount of pressure lost, and not the physical size of the leak. These leaks can be really small.

P0456 is a universal OBDII trouble code. This means that regardless of which make or model of vehicle, the code will mean the same thing (Wrangler or not). The code technically stands for:

System Small Leak – Evaporative Emission System

The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. When there is a small leak in the Jeep Wrangler’s EVAP system, it will throw the P0456 OBDII Code. If there is a large leak, it’ll throw P0455.

P0456 code will typically not be accompanied by any noticeable symptoms other than the smell of gas and the service engine soon light.

You should particularly notice the smell of fuel around the fuel tank area or fuel filler tube.

The EVAP system deals directly with fuel vapors. If these vapors are leaking from the system, you’ll often smell them faintly while operating the vehicle. But, it won’t affect the way the engine itself runs. The EVAP system deals with fuel vapor, and not the running of the engine in your Wrangler.

There are many things that can cause the P0456 trouble code to trigger in your Jeep Wrangler. If your Wrangler has warned you at all in the last few months that the fuel cap was off when it wasn’t, then replacing it would be a great first step.


Here are the most common problems that will throw the code, presented in order (somewhat) from most to least likely:

• Evap System Hose– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. This will cause the P0456 code. Look for either a tear or hole in it. This is one of the most common issues that causes the code.
• Vapor Canister Purge Valve– One of the most common causes of the P0456 code is the vapor canister purge valve. It’s really easy to replace. There are a few clips that you need to find and remove.
• Fuel Tank Sending Unit– It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad. This can reduce tank pressure and throw the code.
• Fuel Cap– A bad fuel cap can cause the code to be thrown for sure. Often, you’ll get a message informing you that the fuel cap is off even when it is on. If you are getting that message, plus a P0456, it may save you a ton of time and money to replace the fuel cap and see if it goes away.
• Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. This gasket can dry out, especially with vehicles that spend their time in dry climates. When it dries out, the fuel tank can’t hold pressure anymore.

P0456 Diagnosis- Jeep Wrangler

A mechanic has a wide range of instruments at his disposal to diagnose what would be causing the P0456 in your Jeep Wrangler. Here are the most common things that are done to diagnose the code:

• The mechanic will typically check to see if there are any other trouble codes. The more trouble codes there are, the easier it can be to diagnose a problem. That’s because when they appear together in certain combinations, there will often only be only a few conditions that will throw any combination of codes at one time.
• After ascertaining what trouble codes appear with the P0456, the mechanic will typically inspect the EVAP system. This includes the purge valve, line, and canister.
• The mechanic will inspect the gas cap to make sure that it can handle pressure. If you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.
• The fuel tank pressure will be checked and monitored.
• After for the checks and fixes listed above, the mechanic will perform two tests:
• A smoke test, and they’ll use a scan tool to confirm that the EVAP solenoids and valves are operating properly.

Here are the most common Wrangler P0456 fixes:

• Gas cap replacement
• EVAP line replacement
• Replace charcoal canister
• Replace the fuel tank

Of all the items listed above, it would be wise to start with the gas cap and work your way to the fuel tank, since the gas cap is far and away the easiest and least expensive items to replace on here.

Here’s a great video on how to test your gas cap.

Good luck figuring out what is causing your Jeep Wrangler to throw the P0456 code. We hope this helps. If there is anything that you feel like you could add, please feel free to leave a comment below.

Is P0456 a Serious Concern?

While P0456 is not going to cause the Wrangler’s engine to stop running, it should not be treated lightly. You could have a fuel leak. Pay extra attention to your tank level and make sure you are not leaking fuel. We recommend taking it in and/or dealing with it right away.

Muceltalk said:

Why is there no recall or class action suit for the problem as it is so common

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My 2021 Jeep is in for the 2nd time for issues with this. Today there were codes for Small Leak and Large Leak. No loaner vehicle from Jeep until Mopar is they speak with the tech. This is ridiculous.

I have been chasing this code and finally found it today. The little plastic fitting for the gas tank vent snapped off. I am going to redneck engineer a fix tomorrow.

Anyone know how many miles for the permanent code to clear once the problem is gone?

Muceltalk said:

Why is there no recall or class action suit for the problem as it is so common

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They will get to that as soon as they do a recall on the poor frame design that causes the frame to rot from the inside out on the 1997 - 2006 Wrangler TJ's

Well, I think I have it fixed!! I didn’t drop the tank either. It was very crammed working in there with my big hands lol, I have the Metalcloak evap relocation kit so that really boxes it in. Use the tension pin and a bunch of jb weld, once that cured also used jb steel stick weld to create and exterior support structure as well. Replaced the hard line with fuel line and ran it up above the parking brake lines and everything else. Nothing should be tugging on it now when it articulates. Hopefully the interior and exterior supports and jb weld do their jobs!! Time will tell. Glad I didn’t have to buy a new gas tank, those are pricey!!

I haven‘t paid much attention to the area. I know when I installed the lift I took a look at the lines as someone mentioned it can create an issue. Which hardline did you replace? From the tank towards the engine compartment? If so I suspect you just standard fuel hose?

If you have good articulation I would definitely address it now before it becomes an issue. It is the hardline line that comes off driver side of the tank and runs up to the filler area (over the rear axle) From the factory the hard line runs under the parking brake lines and gets tugged on under axle droop causing fatigue on the little plastic fitting on the top of the tank.

And yes, standard fuel hose. 5/16” I believe. Used a sharp razor blade to cut the hard line off the sensor. Used the tightening hose clamps. I’ll try and snap a picture when I get a minute.

We’ll even after repairing the gas tank vent, the P0456 code is back. I am gonna change the purge valve, try that. I have changed the gas cap, vent filter, ran along all the hoses, changed the gasket at the evap canister. Exhausted all I can think of. I have this debri build up along the upper and lower air intake plenum. If the gaskets were not seated right or leaking do you think this would trip the code? All the extra debri collection says to me there is a fuel based gas attracting the dust. Please offer any advice, I am at my wits end with this. Been chasing it for months!!

Jermbob28 said:

We’ll even after repairing the gas tank vent, the P0456 code is back. I am gonna change the purge valve, try that. I have changed the gas cap, vent filter, ran along all the hoses, changed the gasket at the evap canister. Exhausted all I can think of. I have this debri build up along the upper and lower air intake plenum. If the gaskets were not seated right or leaking do you think this would trip the code? All the extra debri collection says to me there is a fuel based gas attracting the dust. Please offer any advice, I am at my wits end with this. Been chasing it for months!!

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Sign up for the OP's class action law suite . Lol
Def looks like a pain in the ass to fig out!
You mentioned changing gasket in cannister .
Is it maybe the cannster that's fouled and needs
to be replaced ?
It's possible if gaskets not seated properly could cause an issue ,
As I believe the vacuum generated going threw the
intake would be incorrect .
Did you recently replace plenum gaskets?
If not installed properly would cause an issue right away.
It's possible one may have started leaking .
Cam you smell gas while engine running or actually see any
liquid around the plenum
If it were me I would rule out canister first if no obvious signs
of gas around intake .

I don’t smell gas anywhere… that is the frustrating part. I fixed the oil cooler about 8 months ago. This issue started in may I think. Is there a link the the lawsuit?

I think I might buy a smoke machine. I don’t want to keep throwing money at parts and hope it works. Besides cracks is there anyway to tell the evap canister is bad? Take it out and apply some air pressure into it under water?

I was installing the purge valve last night, replacing hoses. Wrapping more in electrical tape. I found what could possibly be moist dust between the fuel filler rubber and the gas tank inlet. The hose clamp seemed a little loose maybe… I took it off and cleaned it really well, out the clamp back on a lot tighter, ran the emergency brake lines under the filler line. I hate how long it takes for the computer to run its tests.

Thanks for the feedback