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Old 04-08-2013, 09:36 PM   #31
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Quote:
Originally Posted by FreedomEdition View Post
That's a nice looking gas cap. $27 bucks! ...it better do the job!
I hear you! $27 bucks was a lot for a gas cap, but I haven't had any problems with the CEL or evap system since I got it (knock on wood).
Dino

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Old 04-19-2013, 09:53 PM   #32
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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.

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Old 04-19-2013, 10:02 PM   #33
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Originally Posted by Jerry Bransford View Post
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.
I have the OE cap and just got P0456, any cap you'd recommend Jerry? I'll start with that, never had the code before.

Quote:
Originally Posted by Beastmaster View Post
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.
Can you post pics of where your leak was? I'm getting the same code and if a new cap doesn't do it I'm hunting for the leak, all help is appreciated.
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Old 04-19-2013, 10:28 PM   #34
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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.
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Old 04-19-2013, 10:34 PM   #35
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Quote:
Originally Posted by projecttj97 View Post
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.
Any recommendation of aftermarket gas cap? There's mopar ones on quadratec, would that be good?
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Old 04-20-2013, 07:45 AM   #36
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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
Good luck
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Old 04-20-2013, 10:00 AM   #37
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Quote:
Originally Posted by JVLemur View Post
I have the OE cap and just got P0456, any cap you'd recommend Jerry? I'll start with that, never had the code before.



Can you post pics of where your leak was? I'm getting the same code and if a new cap doesn't do it I'm hunting for the leak, all help is appreciated.
Okay, I know this thread is in the TJ section and was started about code P0455. There was some mention of code P0456 here and I have a JK but I think the problems are similar with both models. The thing that drew me to check the tubing were the pics in post #13 of this thread.

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.
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Old 04-20-2013, 10:51 AM   #38
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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
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Old 04-20-2013, 11:49 AM   #39
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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
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Old 04-25-2013, 11:36 AM   #40
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P0455

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?
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Old 04-25-2013, 12:05 PM   #41
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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.

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Old 04-25-2013, 01:45 PM   #42
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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!
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Old 04-26-2013, 12:58 PM   #43
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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?
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Old 04-28-2013, 06:29 PM   #44
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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.
.
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Old 01-11-2014, 09:13 AM   #45
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I have same problem in my 01 tj sport. I have a stant locking gas cap but also my hoses are dry rotted. I am going to replace gas cap with oem cap because the lock on mine was always funky. I am going to check to see if that solved it, but I am getting hoses too and retest. I think mine are definitely hoses, but I am going to try one at a time and see if code p0455 goes away.
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Old 01-11-2014, 10:11 AM   #46
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I Had the same codes and found two hard lines that ran from the fuel tank, along the frame on the drivers side then up toward the motor by the drivers side. They had rubber hoses as an elbow which passed by the two cats coming off the exhaust. They were dry rotted, probably from the heat coming from the cats, as seen in the prior pics on this post. I had to look from under the vehicle to find them though.
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Old 02-25-2014, 07:36 PM   #47
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I have been battling code also.
I have replaced hoses, added clamps.
Fuel cap, vent solenoid, leak detection pump because mine was busted will attach pic of it. Still have code, have traced lines back to tank. Have felt for corrosion on fuel filler and tightened up vac lines and fuel hose on tank. Today I ran codes and p0455 was back again.

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Old 04-28-2014, 11:59 PM   #48
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A two dollar smoke machine?

Would using a cigar work for a smoke machine?

By the way, what's up with the $100 locking gas cap that has to be keyed to the ignition?

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