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

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 02-03-2011, 03:43 PM
SRTWJ04's Avatar
Member
My Jeep: 2004 4.0L WJ
 
Join Date: May 2010
Location: New Jersey
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1699
SRTWJ04 is on a distinguished road
Engine Code- P0456

This code has been killing me for coming on 2 months now.. the MIL lamp is mostly on but sometimes it shuts off after i get a full tank of gas but then comes back on after about a few days.. i bought a new gas cap hoping the new gasket would seal up better since the stock one was shot.. that did nothing.. any suggestions on where i can trouble shoot? not trying to go to a shop and pay all the extra $$ if i can fix it myself.. hoping its just a hose a something.. thanks for the help
__________________

__________________
Louie F.
Reply With Quote
  #2  
Old 02-03-2011, 04:03 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 5,266
Thanks: 9
Thanked 127 Times in 120 Posts
Rep Power: 526307
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: Engine Code- P0456

The leak detection pump is detecting a small leak somewhere. Have a look behind the LH rear wheel cover, there you will find the EVAP canister and several hoses. maybe one hose is in bad shape or loose. The line runs from there to the purge solenoid in the engine bay, so there are many places where a line can be shaved through.
__________________

__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 02-03-2011, 05:19 PM
violant00's Avatar
Premium Member
My Jeep: 2000 4.0L WJ
 
Join Date: Feb 2010
Location: New york, NY
Posts: 438
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 2201
violant00 is on a distinguished road
Re: Engine Code- P0456

the leak detection pump is detecting what exactly that is leaking oil? fuel? coolant?

I have p0494 coming up giving me something up with that leak detection pump
__________________
<img src=http://i955.photobucket.com/albums/ae39/violant00/IMG_0644-1.jpg border=0 alt= />\


00wj Red genIII projector head lights, K&N CAI. (more coming soon!)
Reply With Quote
  #4  
Old 02-03-2011, 05:59 PM
SRTWJ04's Avatar
Member
My Jeep: 2004 4.0L WJ
 
Join Date: May 2010
Location: New Jersey
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1699
SRTWJ04 is on a distinguished road
Re: Engine Code- P0456

thanks frango.. its been a rough winter here in jersery so maybe some salt got to the lines.. and violent p0456 is an evap code detecting a slight leak in gasoline fumes
__________________
Louie F.
Reply With Quote
  #5  
Old 02-03-2011, 07:45 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 5,266
Thanks: 9
Thanked 127 Times in 120 Posts
Rep Power: 526307
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: Engine Code- P0456

Is P0494 not a "FAN SPEED LOW" code?
The P0456 code is indeed a leak detected somewhere in the EVAP system. That system catches the fuel vapors from the fuel tank and reroute them to the engine inlet to burn them off. The purge solenoid controls the flow of vapors (or in fact the PCM controls it by pulsing the purge solenoid)
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #6  
Old 02-03-2011, 07:49 PM
pattyboy's Avatar
Premium Member
My Jeep: 2011 3.6L WK2
 
Join Date: Sep 2010
Location: middle village n.y.
Posts: 266
Thanks: 10
Thanked 1 Time in 1 Post
Rep Power: 1846
pattyboy is a glorious beacon of light
Re: Engine Code- P0456

Have a smoke test done helps in locating leaks..........
__________________
Reply With Quote
  #7  
Old 02-04-2011, 06:53 AM
206WJ's Avatar
Member
My Jeep: 2002 4.7L WJ
 
Join Date: Feb 2010
Location: Seattle, WA
Posts: 696
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 2514
206WJ has a reputation beyond repute206WJ has a reputation beyond repute
Re: Engine Code- P0456

I had the same code, and it was a couple of cracked lines going from the purge solenoid to "somewhere." I just replaced them with new lines (I think 1/4") and it has been all good.
__________________
Reply With Quote
  #8  
Old 02-04-2011, 03:19 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 69 Times in 58 Posts
Rep Power: 1653061
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
Re: Engine Code- P0456

look at all the lines near the intake manifold... look at the purge solenoid and follow the lines as far as you can. If you see any cracking in the end of the hose, replace the hose with bulk hose. The hose I have found to be causing the issue more often than not on the WJ is directly above the axle. A hard hose running from the front of the vehicle to the back of the vehicle goes to soft hose at that point and usually the hose is cracking at the buldge on the hard hose (the buldge to help keep the joint together). I have found there to be plenty of slack in that hose to cut the bad end off and just reconnect it.

Good luck!
__________________
Reply With Quote
  #9  
Old 02-05-2011, 10:49 AM
SRTWJ04's Avatar
Member
My Jeep: 2004 4.0L WJ
 
Join Date: May 2010
Location: New Jersey
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1699
SRTWJ04 is on a distinguished road
Re: Engine Code- P0456

Thanks everyone! tips are much appreciated
__________________
Louie F.
Reply With Quote
  #10  
Old 03-06-2011, 11:06 AM
Member
My Jeep: 2004 4.7 HO WJ
 
Join Date: Jan 2011
Location: Fortville, Indiana
Posts: 109
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 1528
Me Fix is on a distinguished road
Re: Engine Code- P0456

I read thru this complete thread and followed the hard lines back to the rear axle. Just above the rear axle I found the rubber hose connection to the forward going hard line. This rubber hose was a formed factory piece with cracks at the connection point. I spliced in a piece of rubber 3/8 hose using a hard piece of copper tubing. After what I believe was four successful key cycles, the code light went off and it appears the problem has been corrected at least for now. Yes, the gas cap can cause this problem too. I had already replaced the rubber hose pieces under the hood. They were the easiest ones first.
So just wanted to thank the last reply for directing me right to the problem.
__________________
Reply With Quote
  #11  
Old 03-08-2011, 03:49 AM
2005JGC's Avatar
Senior Member


My Jeep: 2005 4.7L WK
 
Join Date: Nov 2010
Location: Portland, OR
Posts: 2,751
Thanks: 51
Thanked 69 Times in 58 Posts
Rep Power: 1653061
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
Re: Engine Code- P0456

no problem
__________________
Reply With Quote
  #12  
Old 05-10-2011, 06:43 PM
Member
 
Join Date: Mar 2011
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1415
RamboTambo is on a distinguished road
Re: Engine Code- P0456

I just got this code on my 05 WK, I haven't looked at it yet because there just hasn't been time to but are the hoses routed the same on the WK as the WJ?
__________________

__________________
Reply With Quote
Reply

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
Engine Oil Cooler 5.7 engine lyndelw Engine Performance/Intakes/Exhausts 33 03-20-2014 08:50 PM
How do I rev my engine from the engine bay? CherokeeOnToyos Engine Performance/Intake/Exhaust 6 10-02-2010 07:56 AM
Code Robert Palmer Trouble Shooting/Problems/Service 14 05-17-2010 11:48 PM
check engine light code 99limited Troubleshooting/Problems 4 03-27-2010 09:43 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 02:18 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by Chrysler Group LLC.