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-   -   P0455 code! Emission Leak Monitor Large Leak Detected (http://www.wranglerforum.com/f282/p0455-code-emission-leak-monitor-large-leak-detected-182224.html)

hagler123 08-22-2012 03:59 PM

Hey jeepers, my 2001 Jeep wrangler 4.0L auto. Is giving codes P0455 and P0442 which my scanner says are "Evaporative Emission Leak Monitor Medium and Large Leak Detected" CAN ANYONE TELL ME WHAT THIS MEANS AND HOW IT CAN BE FIXED? THANKS! This isn't a major issue code cause I've been driving with the check engine light on for about a year!

Jerry Bransford 08-22-2012 04:01 PM

Leaky gas cap? Missing or loose gas cap when engine started? Decayed/crumbling rubber hose in the evaporative system?

hagler123 08-22-2012 04:03 PM

I've replaced the gas cap with a Stant locking gas cap just recently. So ill have to look into your 2nd suggestions. Thanks!

Jerry Bransford 08-22-2012 04:04 PM

Aftermarket locking gas caps often leak air through the lock mechanism. I'd switch back to the OE gas cap and I'll bet the problem goes away after that.

hagler123 08-22-2012 04:06 PM

Well when I had the oe gas cap just a week ago I still had the codes before so the oe gas cap and aftermarket gas caps aren't the problem

wtbiv73 08-22-2012 04:57 PM

I get the same codes, only mine says small leak. Pain in the butt to find...im still looking for mine.

bobthetj03 08-22-2012 06:43 PM

Check the evap line going into the intake manifold. There is a 90 degree rubber boot that plugs into the manifold that usually corrodes. Also check that same line underneith by the driver side frame rail. The line goes from steel line to rubber hose. That rubber hose may be corroded too.

hagler123 08-22-2012 08:20 PM

http://farm9.staticflickr.com/8305/7...d074c3e9_s.jpgwell i think i found the leak its in these hoses. maybe the pics will show belowhttp://www.flickr.com/photos/85579016@N02/7841806860/

Kewrock 08-23-2012 07:22 PM

Quote:

Originally Posted by hagler123 (Post 2713802)
http://farm9.staticflickr.com/8305/7...d074c3e9_s.jpgwell i think i found the leak its in these hoses. maybe the pics will show belowhttp://www.flickr.com/photos/85579016@N02/7841806860/

Can you post a larger picture? I bought my jeep yesterday. Today: LET THE PROBLEMS BEGIN!!!

My engine light tripped and I got po455(p0455) Gross Evap Leak. In my old Volvo It was a cheap little purge valve Right on top of the engine 20 bucks and no tools needed. When I posted on the Volvo forum I got a half dozen responses immediately, all saying the exact same thing. It was a very well known failure point.

Does any body know if there's any "known issues" for jeeps with this code?

hagler123 08-23-2012 07:27 PM

I don't really know how to post pics when using the webpage site. I've always used my app to post pics but it stopped working. So when I tryed to use the webpage site on my laptop it was small for some reason

relgnarw peej 2002 08-23-2012 07:57 PM

I had the same code, so I hooked up a smoke machine from work and found just about every rubber hose and gas cap had a leak. $4 fer hoses n a new o ring on the cap and all was good. The worst one was the hose that fed into the intake ,

Gary2 08-23-2012 08:21 PM

my daughters XJ had the same code twice in two weeks .Very loose gas cap both times .

hagler123 08-23-2012 09:36 PM

Finally got it!!
http://i1159.photobucket.com/albums/...3/93fdf0d6.jpg








http://i1159.photobucket.com/albums/...3/0d7e1455.jpg

BKC90 10-29-2012 12:42 AM

I have the same code for my 02 tj 2.5L, did the replacement of the above cracked hoses solve your issue?

King_Aragon 10-29-2012 10:39 AM

I just got it again! I have no clue what it means now?! I bought new gas cap from autozone and that worked for 1 month. Now it still says P0455 could it result from topping off your gas?

hagler123 10-30-2012 02:24 PM

Like above I replaced some dry rotted vacuum hoses and it fixed my problem, I was getting your same code. If you look around your engine and don't find any cracked hoses you need to take it to an auto shop and have it smoke tested. The shop will connect a smoke machine to your hose system and it will reveal any leaks

Jeepatron 10-31-2012 08:26 AM

I thought i was the only one with this problem. Ive got an 01 4.0 5sp mine code is p0455 its been there every since ive got my jeep. Could this cause any major problems if its not fixed?

hagler123 10-31-2012 10:27 AM

Quote:

Originally Posted by Jeepatron
I thought i was the only one with this problem. Ive got an 01 4.0 5sp mine code is p0455 its been there every since ive got my jeep. Could this cause any major problems if its not fixed?

I was running with the code for about a year and never had any problems and went I fixed it I never really felt any difference in performance but it could have helped MPG a little

Jeepatron 10-31-2012 06:52 PM

Quote:

Originally Posted by hagler123

I was running with the code for about a year and never had any problems and went I fixed it I never really felt any difference in performance but it could have helped MPG a little

Thank you, im sure it would help my mpg a little bit because mine is terrible right now

klkb 11-21-2012 12:35 PM

Does anyone know if the EVAP designation after the code mean anything more specific?

TheBigMan 11-21-2012 01:51 PM

My wife's Libby throws the same code. I changed the gas cap a while back, didn't do a thing. I'm sure it is a dry-rotted hose that I haven't been able to locate yet. She's been driving it around for a while with no issues. The only issue we will have is when we go to get it inspected...it can't pass with a CEL on.

OK_TJ 11-21-2012 05:26 PM

I had the same problem this summer. It was the short hose shown in one of the pictures. It was cracked on the back side where you could not see it. No problems since replacement.

relgnarw peej 2002 12-06-2012 08:32 PM

If all else fails do like I did and spend $20 on a homemade smoke tester for your evap system. I was bullied by that code for a year n come to find out the replacement gas cap i put on from autozone was crap and leaked worse than the faulty cap that needed replaced.

BIGDINO 01-25-2013 07:15 PM

So I've been scratching my head over the p0455 code for the past month. I read pretty much every thread on WF along with other jeep forums. I did what everyone recommended - replacing the gas cap with a factory cap from an auto parts store and disconnecting the negative terminal on the battery to reset the CEL, following the fuel lines and looking for cracks, etc., but nothing worked. I didn't find any cracks so I assumed that the leak was somewhere near the gas tank. I didn't want to bite off more than I could chew by dropping the fuel tank, so I decided to suck it up and take it to a shop to get it smoked.

I just dropped it off at Firestone and they first asked me if I had replaced the gas cap (which I thought was pretty cool - I feel like the stealership would have just taken my jeep and not asked me about this before performing a diagnostic check and billing me.). I told them about everything that I've done to try to remedy the CEL code, so they performed the smoke test. Turns out that my new factory gas cap, which I purchased from a reputable auto parts store, was the culprit. :facepalm: The Firestone guys said that it wasn't the right gas cap, thus not sealing correctly, and that my fuel system did not have any other leaks. They replaced the gas cap and I'm good to go now.

So, if you get this error code in the future and try everything that is recommended by the pros here on WF, I suggest paying the extra $9 to buy a second factory gas cap just to rule it out before you pay a mechanic to do a diagnostic test. It would have saved me $128.00 today!

Dino

fab86 02-13-2013 01:06 PM

I just wanted to thank the OP for the thread, and all of the folks who replied with the useful info. Geez, I love this forum, my wallet more so...

FreedomEdition 04-05-2013 08:22 PM

Home Made Smoke Tester?
 
Quote:

Originally Posted by relgnarw peej 2002 (Post 3075775)
If all else fails do like I did and spend $20 on a homemade smoke tester for your evap system. I was bullied by that code for a year n come to find out the replacement gas cap i put on from autozone was crap and leaked worse than the faulty cap that needed replaced.

Hi relgnarw peej ... I've got codes P0442, P0455, P0456... EVAP Leaks small/large... been there forever... gonna try to eliminate them as I want to sell it. I'm interested in how you made your "homeade smoke tester". I also have gotten gas caps, several, from Autozone. Did you ever find a good cap, and if so, where did you get it?

I have a 2003 Jeep Wrangler Freedom Edition 6 Cylinder.

Your Help will be Greatly Appreciated,

John B.

FreedomEdition 04-05-2013 08:27 PM

Hi BigDino... you said the Firestone guys replaced your gas cap... what did they replace it with? Make/Model?

Your Help will be Greatly Appreciated,

John B.

mpbannon60 04-05-2013 08:28 PM

I found an evap leak on a steel hose going back by the coil mount so I'd say check all your lines

BIGDINO 04-05-2013 11:29 PM

1 Attachment(s)
Hey, unfortunately I don't know the actual part number for the gas cap. I found my receipt from Firestone and they listed the gas cap as Article # 7030260 ID 1011TN. The cost was $26.99. I recall the guy telling me that he ran over to Autozone for this fuel cap, but I cannot locate it online. I took a pic of my fuel cap. Hope this helps!
Dino

FreedomEdition 04-08-2013 12:42 AM

Quote:

Originally Posted by BIGDINO (Post 3600799)
Hey, unfortunately I don't know the actual part number for the gas cap. I found my receipt from Firestone and they listed the gas cap as Article # 7030260 ID 1011TN. The cost was $26.99. I recall the guy telling me that he ran over to Autozone for this fuel cap, but I cannot locate it online. I took a pic of my fuel cap. Hope this helps!
Dino

Hi BigDino! Thanks for the response. That's very nice of you to provide a photo. That's a nice looking gas cap. $27 bucks! ...it better do the job! I can see there are so many jeep owners with this EVAP problem. Once I decide on a new cap, I'll change it, along with whatever vac lines that look questionable, and then Reset the computer and see what happens.

Thanks Again for Your Help. :thumb:

John B.


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