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Old 06-19-2014, 08:18 PM
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Check engine P0455

So after pulling the same code I had on my truck for the EVAP system large leak, I went underneath and found this melted hose. I have no idea where it goes and I was wondering if it was related.

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Old 06-19-2014, 09:01 PM   #2
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Its possible its hard to tell from the picture try yo follow the hose and see if it run to the charcoal canister or the gas tank if it does then thats the problem the evap system deals with catching the gas vapors from the gas tank and feedin it to the intake to be burned

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Old 06-19-2014, 09:01 PM   #3
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Welcome to the forum! Where does the other end of that hose attach to?? I have a 97 TJ and my evap hose/lines run along the ds frame rail.
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Old 06-19-2014, 09:07 PM
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Welcome to the forum! Where does the other end of that hose attach to??
Thank you! I love the community. As for the hose, I can't tell where it goes! It looks like it would attach to a very small pipe because the hole on the end it tiny
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Old 06-19-2014, 09:21 PM   #5
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See if u can find the tube it hooks to a lot of the evaporation system will be metal tubes that are connected by rubber hoses I always hate tryin to find evap leaks they are a pain half the time im a technician at as hyundai dealer im pretty sure that will be ur problem repair the hose clear the code and go from there
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Old 06-19-2014, 11:08 PM
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See if u can find the tube it hooks to a lot of the evaporation system will be metal tubes that are connected by rubber hoses I always hate tryin to find evap leaks they are a pain half the time im a technician at as hyundai dealer im pretty sure that will be ur problem repair the hose clear the code and go from there
I can't find where it attaches, I've searched and searched to no avail. So the total of my problems (most likely caused by this mystery hose) is the P0455 code that came back on today, a crappy air intake, and the fact that I can't find where this hose attaches.
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Old 06-19-2014, 11:11 PM   #7
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You can't get under your Jeep and follow where that hose goes to? Really?
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Old 06-19-2014, 11:19 PM
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You can't get under your Jeep and follow where that hose goes to? Really?
The other end leads to the top of the transfer case.
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Old 06-19-2014, 11:20 PM   #9
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Your tranny has been out before. It is the breather for it. You can't see where it goes. From behind the skid it goes behind and slightly to the driverside of your stick shift. It ain't causing your code. I'll try for a pic.
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Old 06-19-2014, 11:22 PM   #10
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Ahh I thought it was that end. Let me look.
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Old 06-19-2014, 11:25 PM
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I attempted a picture here. It's pretty dark out but that's my transfer case and it's the hose with the red clamp on it
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Old 06-19-2014, 11:25 PM   #12
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It sticks in a clip. Top of tranny above the slave cylinder. You can't see it. You can feel it. It's held on with a tranny bolt that is removed to remove tranny. If you feel up the driverside bell housing to the rear and don't feel it it is probably missing.
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Old 06-19-2014, 11:30 PM   #13
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I attempted a picture here. It's pretty dark out but that's my transfer case and it's the hose with the red clamp on it
Just traced that one it goes there. I'll try to get a pic.

That's above second photo. Laying next to front drive shaft.
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Old 06-19-2014, 11:39 PM
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Just traced that one it goes there. I'll try to get a pic. That's above second photo. Laying next to front drive shaft.
So it just clips on there, not into any metal pipe or anything?
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Old 06-19-2014, 11:49 PM   #15
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Ya. So go in water that deep hope the one way valve works.
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Old 06-19-2014, 11:53 PM   #16
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Everytime my wife's Durango gets a P455 code it's cause someone didn't put the gas cap on right. And it's usually when she fuels at Safeway.....but I won't point fingers....

Check your cap and gasket.

Edit: Would help if I clarify the Safeway thing.....in Oregon it's ILLEGAL to pump your own gas unless motorcycle or Semi....
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Old 06-19-2014, 11:55 PM
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Damn, I was hoping I found my EVAP problem. Thank you for your help though! Any Idea what hoses are involved in the EVAP system and where I should check? I'm pretty sure it's not my gas cap as I have the stock cap and aftermarket caps seem to have more problems. I also tightened it and reset my CEL and it came back on on the next cold start.
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Old 06-20-2014, 12:03 AM   #18
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No clue man. You can get a free fsm from www.jeepslimited.com no 04 but 03 is much the same. You have to register but the don't send a single junk email. It may or may not help with this but it will help with something someday for sure. Wish I could help but I never had that issue. Hopefully someone knows exactly what it is. Good luck.
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Old 06-20-2014, 12:07 AM   #19
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Well if you're sure your cap is ok, you can always find a shop with a "smoke machine" and they can run some through the EVAP to see where it's leaking.

Not sure what year you have but heres a small picture from an 02

2002 wrangler 4.0 6 cylinder error codes P0455 and - Fixya.

Then just confirm the vacuum hoses also (should be a label on the hood)

Just a side note...WD40 (while NOT too good for continued use) can swell the O-ring on the gas cap and is an quick and cheap "test"
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Old 06-20-2014, 12:15 AM   #20
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Another test. (Never done it) spray starting fluid or carb cleaner around the hoses listening for an rpm rise. Sounds like a good test to me.
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Old 06-20-2014, 02:19 AM   #21
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That hose connected to the top of the transfer case is just its vent hose. It keeps water out of the transfer case while letting air in & out as the transfer case temperature varies. The loose end of that hose is supposed to be routed up the engine side of the firewall near the center. Plastic clips on the firewall hold it in position. The white cap at the end of the hose should end up near the top of the firewall.
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Old 06-20-2014, 06:50 AM   #22
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Without a smoke machine it is hard to find hoses that are leaking but one thing u can do is take the canister close valve out and manually hook power and ground to it and see if it operating u should hear it click when u do and if u have a vacuum pump u can hook to it to make sure its sealing when its powered it shouldn't let it vacuum drop at all also u can check the purge valve up near the intake to make sure its sealing properly to it should be closed without power hooked to it the purge valve usually sets a different code but could still cause that code if both of them are good then it could be anything from the evap lines to the fillerneck hose to the charcoal canister or even the fuel pump seal but I'd start with them first
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Old 06-20-2014, 07:54 AM   #23
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Damn, I was hoping I found my EVAP problem. Thank you for your help though! Any Idea what hoses are involved in the EVAP system and where I should check? I'm pretty sure it's not my gas cap as I have the stock cap and aftermarket caps seem to have more problems. I also tightened it and reset my CEL and it came back on on the next cold start.
Evap hoses / lines run from the evap canister to your fuel tank. Follow the lines and look for obvious problems, disconnected, broken, cut, etc. If nothing jumps out at you, take it and have it smoke tested. Hope this helps. Good luck!
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Old 06-20-2014, 03:24 PM   #24
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Gas caps go bad no matter who makes them. I'd try another cap first.
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Old 06-20-2014, 04:58 PM
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Gas caps go bad no matter who makes them. I'd try another cap first.
I'll try it tonight, thanks

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