P0455 code! Emission Leak Monitor Large Leak Detected - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-22-2012, 03:59 PM   #1
Jeeper
 
hagler123's Avatar
 
Join Date: May 2012
Location: Tuscaloosa, Alabama
Posts: 338
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!

hagler123 is offline   Quote Quick Reply
Old 08-22-2012, 04:01 PM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,803
Images: 2
Leaky gas cap? Missing or loose gas cap when engine started? Decayed/crumbling rubber hose in the evaporative system?

__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 08-22-2012, 04:03 PM   #3
Jeeper
 
hagler123's Avatar
 
Join Date: May 2012
Location: Tuscaloosa, Alabama
Posts: 338
I've replaced the gas cap with a Stant locking gas cap just recently. So ill have to look into your 2nd suggestions. Thanks!
hagler123 is offline   Quote Quick Reply
Old 08-22-2012, 04:04 PM   #4
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,803
Images: 2
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.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 08-22-2012, 04:06 PM   #5
Jeeper
 
hagler123's Avatar
 
Join Date: May 2012
Location: Tuscaloosa, Alabama
Posts: 338
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
hagler123 is offline   Quote Quick Reply
Old 08-22-2012, 04:57 PM   #6
Jeeper
 
wtbiv73's Avatar
 
Join Date: May 2010
Location: Bakersfield VT
Posts: 48
I get the same codes, only mine says small leak. Pain in the butt to find...im still looking for mine.
wtbiv73 is offline   Quote Quick Reply
Old 08-22-2012, 06:43 PM   #7
Jeeper
 
bobthetj03's Avatar
 
Join Date: Aug 2011
Location: Lake County, NorCal.
Posts: 1,757
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.
__________________
http://www.wranglerforum.com/f118/pr...er-836497.html

"The little Jeep that could!"
bobthetj03 is offline   Quote Quick Reply
Old 08-22-2012, 08:20 PM   #8
Jeeper
 
hagler123's Avatar
 
Join Date: May 2012
Location: Tuscaloosa, Alabama
Posts: 338
well i think i found the leak its in these hoses. maybe the pics will show below
hagler123 is offline   Quote Quick Reply
Old 08-23-2012, 07:22 PM   #9
Jeeper
 
Join Date: Aug 2012
Location: City of New York
Posts: 150
Quote:
Originally Posted by hagler123 View Post
well i think i found the leak its in these hoses. maybe the pics will show below
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?
Kewrock is offline   Quote Quick Reply
Old 08-23-2012, 07:27 PM   #10
Jeeper
 
hagler123's Avatar
 
Join Date: May 2012
Location: Tuscaloosa, Alabama
Posts: 338
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
hagler123 is offline   Quote Quick Reply
Old 08-23-2012, 07:57 PM   #11
Jeeper
 
relgnarw peej 2002's Avatar
 
Join Date: Aug 2012
Posts: 56
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 ,
__________________
my jeep is ticking lol
relgnarw peej 2002 is offline   Quote Quick Reply
Old 08-23-2012, 08:21 PM   #12
Jeeper
 
Join Date: Jan 2009
Location: South Jersey
Posts: 923
my daughters XJ had the same code twice in two weeks .Very loose gas cap both times .
__________________
05 TJ Rubicon 4.88s ,2" BDS, Bilstein 5100, Currie Currectlync , Savvy arms/Metalcloak Duroflex joints, JKS BL, 33"Cooper STT's, Mc front Track Bar
Gary2 is offline   Quote Quick Reply
Old 08-23-2012, 09:36 PM   #13
Jeeper
 
hagler123's Avatar
 
Join Date: May 2012
Location: Tuscaloosa, Alabama
Posts: 338
Finally got it!!









hagler123 is offline   Quote Quick Reply
Old 10-29-2012, 12:42 AM   #14
Newb
 
BKC90's Avatar
 
Join Date: Oct 2012
Location: Calgary,AB
Posts: 2
I have the same code for my 02 tj 2.5L, did the replacement of the above cracked hoses solve your issue?
BKC90 is offline   Quote Quick Reply
Old 10-29-2012, 10:39 AM   #15
Jeeper
 
King_Aragon's Avatar
 
Join Date: Apr 2012
Location: Hell Paso
Posts: 264
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?
King_Aragon is offline   Quote Quick Reply
Old 10-30-2012, 02:24 PM   #16
Jeeper
 
hagler123's Avatar
 
Join Date: May 2012
Location: Tuscaloosa, Alabama
Posts: 338
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
hagler123 is offline   Quote Quick Reply
Old 10-31-2012, 08:26 AM   #17
Newb
 
Jeepatron's Avatar
 
Join Date: Oct 2012
Posts: 4
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?
Jeepatron is offline   Quote Quick Reply
Old 10-31-2012, 10:27 AM   #18
Jeeper
 
hagler123's Avatar
 
Join Date: May 2012
Location: Tuscaloosa, Alabama
Posts: 338
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
hagler123 is offline   Quote Quick Reply
Old 10-31-2012, 06:52 PM   #19
Newb
 
Jeepatron's Avatar
 
Join Date: Oct 2012
Posts: 4
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
Jeepatron is offline   Quote Quick Reply
Old 11-21-2012, 12:35 PM   #20
Jeeper
 
klkb's Avatar
 
Join Date: Feb 2012
Location: Gainesville, Virginia
Posts: 2,976
Does anyone know if the EVAP designation after the code mean anything more specific?
klkb is offline   Quote Quick Reply
Old 11-21-2012, 01:51 PM   #21
Jeeper
 
TheBigMan's Avatar
 
Join Date: Sep 2012
Location: Not where I want to be...
Posts: 775
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.
__________________
Teamwork makes the Dream work.
TheBigMan is offline   Quote Quick Reply
Old 11-21-2012, 05:26 PM   #22
Newb
 
OK_TJ's Avatar
 
Join Date: Nov 2012
Posts: 13
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.
OK_TJ is offline   Quote Quick Reply
Old 12-06-2012, 08:32 PM   #23
Jeeper
 
relgnarw peej 2002's Avatar
 
Join Date: Aug 2012
Posts: 56
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.
__________________
my jeep is ticking lol
relgnarw peej 2002 is offline   Quote Quick Reply
Old 01-25-2013, 07:15 PM   #24
Jeeper
 
Join Date: Dec 2012
Location: Suisun City, CA
Posts: 25
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. 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
BIGDINO is offline   Quote Quick Reply
Old 02-13-2013, 01:06 PM   #25
Jeeper
 
fab86's Avatar
 
Join Date: Jan 2013
Location: Lower Alabama
Posts: 29
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...
__________________
I think I have an inferiority complex, but I doubt it's a good one...
fab86 is offline   Quote Quick Reply
Old 04-05-2013, 08:22 PM   #26
Jeeper
 
Join Date: Sep 2012
Posts: 19
Home Made Smoke Tester?

Quote:
Originally Posted by relgnarw peej 2002 View Post
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 is offline   Quote Quick Reply
Old 04-05-2013, 08:27 PM   #27
Jeeper
 
Join Date: Sep 2012
Posts: 19
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.
FreedomEdition is offline   Quote Quick Reply
Old 04-05-2013, 08:28 PM   #28
Jeeper
 
mpbannon60's Avatar
 
Join Date: Jun 2011
Location: boothwyn pa
Posts: 101
I found an evap leak on a steel hose going back by the coil mount so I'd say check all your lines
mpbannon60 is offline   Quote Quick Reply
Old 04-05-2013, 11:29 PM   #29
Jeeper
 
Join Date: Dec 2012
Location: Suisun City, CA
Posts: 25
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
Attached Thumbnails
Click image for larger version

Name:	20130405_210019.jpg
Views:	141
Size:	219.9 KB
ID:	232246  
BIGDINO is offline   Quote Quick Reply
Old 04-08-2013, 12:42 AM   #30
Jeeper
 
Join Date: Sep 2012
Posts: 19
Quote:
Originally Posted by BIGDINO View Post
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.

John B.

__________________
Enjoy Everything!

"Kindness in words creates confidence. Kindness in thinking creates profoundness. Kindness in Giving creates Love." ~ Lao Tzu

"Got Kindness" ~ john v. brennan
FreedomEdition is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Featured Product

All times are GMT -5. The time now is 01:46 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC