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Old 11-03-2010, 12:23 PM   #1
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Needing some help with codes

My check engine light came on and is throwing P0442 and P0455.

I know that theses are, but can't seem to get rid of them. I replaced the gas cap, checked all of my lines, and checked the charcoal canister. The canister doesn't seem to have and holes or cracks in it.

I guess my question is could it just be a sensor gone bad, or maybe the charcoal canister needs to be replaced. I can't seem to figure it out.

The thing that blows my mind is that I'm getting P0455, but my gas mileage is still doing good, if not a little better. I'm getting roughly 15-21 mpg depending where I am driving.

I could really use some help. I am wanting to get this code cleared.

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Old 11-03-2010, 09:30 PM   #2
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Same boat man... I just cant figure them out either

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Old 11-04-2010, 07:01 AM   #3
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It seems like no one knows how to fix the problem....I can't figure it out...I guess it could be worse though...At least it still runs fine...
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Old 11-04-2010, 08:09 AM   #4
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I guess it leaking somewhere there isnt really much help... I is really annoying though
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Old 11-04-2010, 08:45 AM   #5
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I have the same problem on my 02. I dropped the tank and replaced all the vent hoses because they where loose with dry rot. I still get a loose gas cap code if it's not turned a few times after a fill. I think the filler neck in out of round due to the gas man banging the gas fill tube on it for the last 8 years. After 3 new gas caps my brother suggested putting a film of silicon grease on the cap gasket and it worked. Silicon grease is in the plumbing section of the hardware store. Hope this helps out.
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Old 11-04-2010, 10:34 AM   #6
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make sure you check the lines around the canister, purge valve, vent valve really well. Its common for chrysler evap lines to crack around those points.

Usually ends up being the little ones on each side of the green cap.
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Old 11-04-2010, 11:12 AM   #7
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AS I said earlier, I have checked all of these lines already and they are all in good shape. The Canister is good also, as far as I can tell. There are no cracks on it.
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Old 11-04-2010, 11:28 AM   #8
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Same here ... Maybe near the tank is next to try how much silicon did you put on ... And where did you pit it... The cap or the filler tube part
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Old 11-04-2010, 12:14 PM   #9
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I put a thin coat on the gas cap o-ring and a thin coat on the filler neck opening. I replaced the filler hose as well when I had the tank off. I need to check a dealership for a new filler neck due to the fact that I cant find one online for my year and make.
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Old 11-04-2010, 12:15 PM   #10
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I also had a strong gas smell around the rear of the Jeep.
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Old 11-04-2010, 12:41 PM   #11
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Doing all of this cleared you codes??
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Old 11-04-2010, 01:37 PM   #12
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Quote:
Originally Posted by bal31
Doing all of this cleared you codes??
I reset the computer to clear the codes. I still get a loose gas cap code once in a while but as for the rest they went away after the repair.
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Old 11-04-2010, 01:42 PM   #13
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Were you getting P0442 or P0455 or others??
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Old 11-04-2010, 01:47 PM   #14
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Quote:
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I reset the computer to clear the codes. I still get a loose gas cap code once in a while but as for the rest they went away after the repair.
Dropping the tank was done after reconnecting and hose clamping all the evaporate lines. I was beside myself as well and I really didn't want to spend the money on a smoke test.
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Old 11-04-2010, 01:49 PM   #15
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Quote:
Originally Posted by bal31
Were you getting P0442 or P0455 or others??
Yes but now only PO456,
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Old 11-05-2010, 05:42 AM   #16
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I am going to try the Silicone Grease this weekend and clear them out and hopefully they will stay gone.
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Old 11-06-2010, 08:45 AM   #17
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Put the silicone on yesterday afternoon and cleared them out. I guess we will just wait and see what happens. I notices that the seal of the gas cap had a spot on it that looked like it might not be sealing off good. When I first put the new cap on, and refilled the tank, I twisted the cap, and it sucked in a ton of air, so I know the new cap sealed off good then. Hopefully this will work for now.
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Old 11-06-2010, 11:08 AM   #18
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Quote:
Originally Posted by Hardermods
make sure you check the lines around the canister, purge valve, vent valve really well. Its common for chrysler evap lines to crack around those points.

Usually ends up being the little ones on each side of the green cap.
What the hell is that big black box?? I don't have that on my 05' TJ... Am I suppose to
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Old 11-06-2010, 12:32 PM   #19
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Thats the charcoal canister for the emissions system, you should have one on the 05s its in behind the wheelwell liner on the right rear corner
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Old 11-11-2010, 11:56 PM   #20
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Did the silicone fix it
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Old 11-12-2010, 07:15 AM   #21
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Nope the light came back on...I hate this thing!!!
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Old 11-15-2010, 07:10 AM   #22
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I filled my tank up last night, and went to a friends house for about 3 hours or so...Came back out to the jeep to leave and got it and it had a strong gasoline smell to inside...Then I got up for work this morning, and walked by the jeep to get in, and again it had a really strong gasoline smell around the gas tank area.

What is causing this?? How hard is it to drop the tank and make sure all of the lines are good? could it be the filler neck??
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Old 11-15-2010, 07:47 AM   #23
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If the Tank is leaking this will also set the code. The tank is part of the Evap circuit. You might have to drop the tank and check the o-ring around the pump housing.
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Old 11-15-2010, 08:22 AM   #24
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How do you drop the tank??? I would assume that it is best to drop the tank when I it virtually empty. Any tips would be appreciated.
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Old 11-15-2010, 08:41 AM   #25
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on my 1999 dropping the gas tank was pretty easy
more so if you have a lift available.

just a couple of strap bolt that are loosened.

Its even easier if you remove the bumper which in my case was the OEM Stock one.
Less fuel = less weight
if you have a buddy to help that also makes it easy and usually longer to do
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Old 11-15-2010, 08:58 AM   #26
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Make sure to lower tank slightly and disconnect all wires and hoses from the top of the tank before dropping it and finding out you forgot to unplug something.
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Old 11-15-2010, 10:15 AM   #27
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Fuel pump threded cap ring

My fuel pump cap ring was loose when I dropped my tank, don't really know if it was part of the problem.
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Old 11-16-2010, 07:19 AM   #28
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does anyone have any pics of the fuel pump and the cap ring??
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Old 11-16-2010, 08:04 AM   #29
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Old 10-07-2013, 06:59 PM   #30
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Sorry silicone on cap does not work I put a new cap on my 01 TJ and a few days
later light came back on po456 code

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