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Unread 02-20-2014, 07:59 PM   #1
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2005 WK 
Join Date: Dec 2013
Location: Orlando, Fl
Posts: 22
evap help!

Hey guys

I have a 2005 jeep grand cherokee 5.7L stock.

I have fought with p0446 fixed with new TB

Just fixed P0441 by changing the LDP.

But 200 miles later I got P0456????

Let me tell ya i have been fighting evap leak since 02 with my dodge ram 1500.. and it continues to stump me....

I have a brand new LDP and gas cap(always tighten to 4 clicks) and i never fill with the jeep running and i always stop filling when it clicks.

any suggestions?


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Unread 02-20-2014, 08:21 PM   #2
Keep on Jeepin on........
JeepN4KC's Avatar
Join Date: Jul 2011
Location: Blue Springs, MO
Posts: 6,549
The code you're getting is for a small evap leak. It's partner in crime is the 0455 gross evap leak. Both can be a nightmare to track down. The evap leaks are fairly common over on the XJ side - but those are older models with typically more worn out parts/lines.

Best thing I could recommend is to give all the evap components and lines and connections a good lookover. A small leak could indicate a minor crack or pinhole in a line or connection. There should also be a green cap (access port used for smoke testing usually tagged with a 1psi max) at the purge solenoid. Check that the cap is tightened all the way.

Many cases getting a smoke test is your best bet from what I read. I've been trying to track down a gross leak 0455 on my XJ for over a year now to no avail. However, other than possible issues getting the rig to pass emissions regs, the emissions evap leaks really shouldn't effect how the rig runs. For this reason, I haven't dedicated a lot of time trying to fix it. It also hasn't prohibited getting my tags for the Jeep.

Other thing I can think of is to disco the battery for 10 minutes or so to reset the code and see if it comes back. You mentioned replacing the Leak detection pump and gas cap but sometimes if the code isn't reset it will still pop the check engine light.

Good luck.

Build Thread WK
Other Build Thread XJ
September 2013/January 2015 COTM
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Unread 02-20-2014, 09:11 PM   #3
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2005 WK 
Join Date: Dec 2013
Location: Orlando, Fl
Posts: 22
Thanks bud ill be going over it all tomorrow. I have a code reader and erased all codes it just funny to me, that I fixed 2 different codes and within a few hundred miles it pops up with a new one...

Well thanks for your help!! I'll post back with a solution if found!
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Unread 02-21-2014, 08:30 AM   #4
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Join Date: Jan 2010
Location: Gunnison, CO
Posts: 2,611
Look at the hard plastic lines (shiny black) that run to the evap vacuum pump under the hood. They crack from age.
2008 WK 4.7 V8 Build/Adventure Thread
2013 Hemi Durango
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