'03 P455 Code - moe details in msg - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Troubleshooting/Problems

Thread Tools Display Modes
Old 09-04-2011, 01:42 PM
tommc4's Avatar
My Jeep: 2003 4.0L WJ
Join Date: Aug 2011
Location: Virginia Beach VA USA
Posts: 41
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 2189
tommc4 is on a distinguished road
Send a message via Yahoo to tommc4 Send a message via Skype™ to tommc4
Question '03 P455 Code - moe details in msg

Well, I have been getting the P455 code for a month or two now. I know it says a "Evaporative Emission Control System Leak Detected (large leak)". I have noticed that when I open the gas cap, I don't hear the "hiss" from the pressurization, so I am thinking, maybe the neck or something in the gas tank system?

Replaced the gas cap, no change. I can clear the code, but it comes back in +/- 24 hours, depending on how much I drive. I am sure this is screwing up my mileage as well...

My brother (owns a tranny shop) says that it is tricky to "fix" because it could be a bunch of things. He says he has seen people sepnd a thousand dollars at dealers trying to clear this issue!

Any thoughts? I want to try and fix this before it gets cold...

Tom McElvy
Virginia Beach VA
'03 GC WJ Inferno Red Tinted Pearl
4.0L I6

Reply With Quote
Sponsored Links
Old 09-04-2011, 03:34 PM
2005JGC's Avatar
Senior Member

My Jeep: 2005 4.7L WK
Join Date: Nov 2010
Location: Portland, OR
Posts: 2,751
Thanks: 51
Thanked 73 Times in 61 Posts
Rep Power: 1653984
2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute
Your brother is wrong... Sorry. Its generally decently quick and easy. That said I can quickly verify a repair with a forced monitor (using DRBIII) and for you it will require replacing hose, clearing codes and driving it for a couple days. typically a visual inspection will locate the problem. Typically its cracked hoses, look over all the rubber hoses fine cracking typically it happens ar the flaired portion of the tubes. I'm on my phone and this blows... If you search p0455 or evap leak I have listed places to look on the wj.

Now that Im not on my phone, common leak points are the hoses near the intake manifold (locate the purge solenoid, mounted to the drivers side of the engine bay with 2 hoses going to it)... follow these 2 hoses and inspect ALL rubber hoses that are in this system. Know that just looking at them will sometimes not reveal anything, if you look at the end of the hose (picture for you... O ) you will see a bunch of cracks. Also on the wj right above the rear axle there is a portion of hard line (that stretches from the front to the rear of the vehicle) just over the axle it goes to rubber line and this line likes to crack right at this joint at the ferrule on the hard line. This hose I have found enough slack that the 1-1.5" you cut off it you can just plug it back in with a fresh hose end... up under the hood replace any cracking hose with bulk hose, clear the codes and drive it.

Sent from my SCH-I500 using Tapatalk
2005 Jeep Grand Cherokee - Gone but not forgotten!

Reply With Quote
Old 09-05-2011, 09:38 AM
My Jeep: 2004 4.7 HO
Join Date: Dec 2010
Location: Western PA
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 2389
mtbitt is on a distinguished road
Re: '03 P455 Code - moe details in msg

If you are unable to see a cracked line or hose visually, find a shop with a "Smoke Machine". This hooks up to your evap. system and filles it with smoke, then the smoke escapes wherever the leak is.

Sometimes not real easy to find, but look at all the bends in any rubber lines, and where the rubber lines slide onto a fitting like mentioned in earlier post.

Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Please add your order details to your signature rdalcanto Grand Cherokee - WK2 - 13 11-26-2010 08:45 AM
Off the boat ready to smoke Moe! tugboatchad Grand Cherokee SRT8 - WK 17 08-11-2010 03:51 AM
New Details 5/19/2010 JEEPWK2 Grand Cherokee - WK2 - 27 05-22-2010 04:08 PM
Mopar CAI Details? Rich Performance Modifications 5 02-25-2010 12:46 PM
Build sheet details NHWK05 Grand Cherokee - WK 27 07-10-2009 12:36 PM

» Premium Vendor Showcase
Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 02:40 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.