Jeep Wrangler P0456 – Leak in the EVAP System – Answered

What does the Jeep Wrangler code P0456 mean?

The code P0456 means there’s a small leak in the EVAP system of your Jeep Wrangler. If you see that code pop up, you’re driving with a car that’s releasing more fumes than usual. While far from dangerous for your car, it’s a little troublesome for the environment.

Jeep Wrangler Code P0456

Symptoms of code P0456

  • Check Engine Light is on
  • Fuel odor

Causes of code P0456

  • Leak in EVAP System

Fixes for code P0456

  • Readjusting or replacing the gas cap
  • Unclogging or replacing the valve
  • Fixing or replacing a faulty EVAP hose.
  • Fixing any possible electrical issues

The EVAP (EVAPorative emission control) system is a filter of sorts. It’s in your car to prevent gasoline fumes from releasing into the atmosphere. It’s a great thing to have – and that’s why all cars have it.

The P0456 code represents little trouble for your car. You can drive around with it with no major issues.

With that being said, you should fix that issue. You can probably get it behind you by replacing (sometimes adjusting!) the gas cap.

Why should you fix a small leak in the EVAP system? Well, first, because of the environment. Second, because of your wallet – you can get a big fine in most places for driving with a faulty EVAP system.

And, more importantly, small problems turn into big ones.

A small leak suddenly gets bigger, fumes go where you don’t want them to go, and now you have more problems than before.

So, fix that. I’ll tell you how down below.

Can I drive with a code P0456?

You can drive with a small EVAP leak and cause no damage to your car as you do so. Keep in mind you will experience poor fuel economy and may get a fine from driving with your car like that.

So, while non-threatening for your engine, driving with the code P0456 is dangerous for your wallet.

When I say you can drive with a P0456, I’m not trying to tell you to let the engine light be forever on as you carry on with your business. Not at all!

I’m telling you not to rush your way into fixing it. Don’t miss a day from work or go to the mechanic right away (instead of waiting for the weekend, so you fix the issue yourself).

This code is a small issue that can wait. Of course, it cannot wait for long – because you shouldn’t drive around with engine lights on.

Will an EVAP code clear itself?

In certain scenarios, the engine light coming from an EVAP leak may clear itself after some time. You shouldn’t disregard the issue and hope it clears itself, though. If the code hasn’t gone away after a few days, you need to roll up your sleeves and fix it.

Sometimes, a loose hose or a poorly adjusted gas cap triggers the code P0456.

Those are small issues that would take a minute to solve. From time to time, you don’t even have to pay attention to them – because they solve themselves.

I have no idea why. Maybe the vibrations of the car readjust the hose. Perhaps it’s car magic. The thing is, if the engine light goes away, problem solved.

Then again, if the light persists after a couple of days, it’s time to get to work. It will not go away on its own.

How much does it cost to fix an EVAP leak?

Fixing a small EVAP leak could cost anywhere from $100 to $700, depending on what needs to be repaired or replaced. You could be looking at an inexpensive issue, like a worn out gas cap, to more expensive stuff, like a faulty purge valve.

I do recommend trying to fix this issue on your own before you go to the mechanic and come back a few hundred dollars lighter.

Of course, you shouldn’t play around with your car if you don’t know how or don’t feel like doing it. Some people prefer to go to the mechanic right away – and that’s fine too!

Here’s what you or your mechanic should do to fix the issue.

What could cause a small EVAP leak?

There are plenty of things that can cause an EVAP leak and trigger the code P0456. You should start small and then move onto checking bigger things.

The first thing you need is a scan tool. Without it, you’ll never know for sure when you fixed your problem.

Here’s how you should do things: First, do a scan. Then, check (and try to fix) an issue. After that, clear the scan tool and re-run a scan. If it shows you the code, check something else; if it doesn’t, you fixed the issue.

Gas Cap

The easiest thing to solve is the gas cap. Check it out. If it’s loose, tighten it. If it’s worn out, replace it. A gas cap is cheap and shouldn’t cost more than a few dollars.

Remember to clear the scan tool and run it again. If the code persists, keep going.

EVAP System’s parts

Now it’s time to check the EVAP itself. Look for a loose or worn out hose. As you know, tighten or re-connect anything loose and replace anything worn out.

The EVAP hose is more expensive than a gas cap and could cost you up to $600. I hope you don’t have to replace that one!

Canister Valve

Are you still getting the code P0456? Alright, let’s check the canister valve.

Look for debris or anything that could be clogging your valves. Check the fuel tank as well and look for leaks there.

At this point, it’s probably the canister. The problem is you need a multimeter to see if it’s faulty or not. You can only check for leaks without it.

If you don’t have a multimeter (or still get the code after checking everything on this list), you need to see a mechanic for a more thorough inspection.

As I’ve said before, fixing this problem could cost you up to $700 – but, don’t worry, it’s usually less than that.

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