|04-28-2013 07:29 PM|
I just got that code the other day and fixed some hoses going to and from my evap canister. I was confused at first what it was because I don't remember it on my '00.
|04-26-2013 01:58 PM|
|d6cat||I have the leak detection pump off to check it. If I apply vacuum to the diaphram side of the electrical switch should it close the valve so that no air will pass through where the 2 large hoses connect? Air passes through whether there is vacuum applied or not. It seems like the passage should close one way or the other. Am I wrong?|
|04-25-2013 02:45 PM|
I just bought my jeep and had a similar problem. At first I tried to find any leaks... No luck. Then I changed the cap, and the code changed to "incorrect flow" on the evap system.
Turned out, someone put the purge valve in upside down! It is clearly labeled "bottom" on one side....but someone had ignored it. Another good check is that one outlet of the valve says "VAC". You should be able to follow that line into the engine block, rather than it traveling to the back and into the fuel tank. Not sure it will help, but something easy for you to check!
I have no idea why the previous owner would have put it upside down. But hey, that's what buying a used car is like!
|04-25-2013 01:05 PM|
I don't know if anyone else had this issue, but when I was going through my new 2002 Sport, I noticed my gas filler tube (the metal piece that gas cap screws into) was rusty, and upon cleaning it, I found 5 small pin holes under the corrosion. When I blew into it with my hand over the end, I could feel air escaping. I spot welded the holes, then painted the hole thing with POR-15. She is tighter than a drum now.
ALSO NOTE: That to double check if the code is fixed, disconnect your battery for 5 minutes, and see if the code comes back.
|04-25-2013 12:36 PM|
projecttj97, I have a 2002 Grand Cherokee 4.0, keeps setting P0455 & P0442. I can't see any cracked lines or hoses. I have smoke checked the system (I haven't figured out how to close the vent, so I plugged the end of that hose) and not found any leaks. The system will hold pressure, only slowly leaking off after over an hour. I thought maybe the leak detection pump wasn't closing when commanded so I replaced it. Still the same problem and no leaks found. Any suggestions?
|04-20-2013 12:49 PM|
|ChaddG||those cracked hoses will pop that code, look at the underside of the hose under the one with the green cap, mine was cracked where I couldnt see it|
|04-20-2013 11:51 AM|
|projecttj97||I believe the jk has the 3.8 and this is the same motor as the caravan. The cars had a evaporated hose that would attach behind the throttle body and the would cracking all the time|
|04-20-2013 11:00 AM|
I'm at work but can post some pics later, but the JK has a tube that runs from the top of the engine, across and down in front of the battery. This tube looks like it had been rubbing against the battery and this is what I repaired.
Looking back, since I did the gas cap and repaired the tube a day apart and it took 5 days for the code to clear, I'm not 100% sure which (or both) cured the problem.
|04-20-2013 08:45 AM|
you guys nailed it b4 me. I had that code. replaced the line with the green cap, dealer only, 32.00 its 2 hoses, cleared my codes, all was fine. drove with that code for 5 years, no probs.
check the rubber fittings that go to the purge valve<by the green cap> get some rubber hose and d.i.y. 2 chunks to connect the plastic to purge.
you will need a code reader to clear the code.
mine started with minor leak code, then major showed up.
your gas cap is probably fine. <unless it's a locking one> they leak through the keyhole
I have a post about this 0455 code too
|04-19-2013 11:34 PM|
|04-19-2013 11:28 PM|
|projecttj97||i'm a tech and my speciality is dealing with emission type codes. And they can drive you crazy. alot of the time i see people get a locking gas caps or stant gas caps and they leak right out of the box. Always buy from the dealer. 2 i always check all the hoses cause most of the time someone has knocked them off or they have started to crack, Alot of times on the 4.0l it's the 90 degree vac hose as stated before. Which you can get from any autoparts store. Any other cracked hose that have been custom formed need to be bought from mopar and can be alittle bit of a task trying to get the correct ones. Also on chrysler i would caution you on smoke testing these without knowing what valves need to be grounded to close to seal the system. But as stated before most of the time evap leaks are simple cracked hoses or gas caps. Any other questions feel free to ask me.|
|04-19-2013 11:02 PM|
|04-19-2013 10:53 PM|
This forum is the greatest!
I had code P0456 come up a few weeks ago and searched the web and was lead back to my favorite Jeep forum.
Reading this thread (and a couple of others) I decided to try a couple of things:
I purchased a locking gas cap (which I was thinking about doing anyway) but it didn't help.
Next, I checked out the tubing that routes near the battery and sure enough, it was worn on one side. I slapped on some RTV sealant and wrapped it with wire wrap (you know, the ribbed kind that comes in rolls) but the light didn't go out.
I had resigned myself to the fact that I'd have to go to the dealer and pay to have it checked out (I have an extended warrenty but have a $100 deductable).
Low and behold, on day 5 after my repair, the light didn't come on and it's still off!
I love this forum, thanks for the help guys.
|04-08-2013 10:36 PM|
|04-08-2013 01:42 AM|
Thanks Again for Your Help.
|04-06-2013 12:29 AM|
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!
|04-05-2013 09:28 PM|
|mpbannon60||I found an evap leak on a steel hose going back by the coil mount so I'd say check all your lines|
|04-05-2013 09:27 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,
|04-05-2013 09:22 PM|
Home Made Smoke Tester?
I have a 2003 Jeep Wrangler Freedom Edition 6 Cylinder.
Your Help will be Greatly Appreciated,
|02-13-2013 02:06 PM|
|fab86||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...|
|01-25-2013 08:15 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. 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!
|12-06-2012 09:32 PM|
|relgnarw peej 2002||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.|
|11-21-2012 06:26 PM|
|OK_TJ||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.|
|11-21-2012 02:51 PM|
|TheBigMan||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.|
|11-21-2012 01:35 PM|
|klkb||Does anyone know if the EVAP designation after the code mean anything more specific?|
|10-31-2012 07:52 PM|
|10-31-2012 11:27 AM|
|10-31-2012 09:26 AM|
|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?|
|10-30-2012 03:24 PM|
|hagler123||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|
|10-29-2012 11:39 AM|
|King_Aragon||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?|
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