thrown codes 4 EVAP leaks post relo
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JK Enthusiast
Joined: Aug 2008
Posts: 130
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From: nyc
thrown codes 4 EVAP leaks post relo
Hello, I moved my EVAP as many have to above the rear axel, and have two codes, p0455, p0456, small evap leak & large evap leak. Anyone else run into this? I reconnected both evap lines with extensions, again with info gleaned from others write ups (thanks).
Stupid second question, a OBD2 reader from the auto store didn't connect with my JK, (08), and it seems the pins don't match, thou the plug fits. Is there a specific Chrysler/Jeep OBD2 or are they all universal? Thanks.
Stupid second question, a OBD2 reader from the auto store didn't connect with my JK, (08), and it seems the pins don't match, thou the plug fits. Is there a specific Chrysler/Jeep OBD2 or are they all universal? Thanks.
JK Junkie
Joined: Apr 2008
Posts: 2,265
Likes: 0
From: Albuquerque, NM
The OBD-II is a generic system as far as Engine related DTCs. It should read for those codes.
As far as your codes after the install, You have to have a leak somewhere? Did you cut a line or damage anything? I don't know if the Jeep evap systems can run a system test that you will need the Jeep Scan tool to do. That will help with the diag but will prob cost money to. If not the old school way is use a smoke machine, and run it from the vent tube at the intake or VSV. And look for smoke. That way is tricky and pretty out there because you would need a machine and have to block off the fresh air tube with pliers.
I would go back and check all connections and make sure there is no torn or cracked hoses, or connectors? Evap can be a little tricky to Diagnosis sometimes. But hopefully in your case it is something simple. Also I don't think in your case this is the problem. But did you remove the gas cap and not tighten it by any chance also?
Good luck
As far as your codes after the install, You have to have a leak somewhere? Did you cut a line or damage anything? I don't know if the Jeep evap systems can run a system test that you will need the Jeep Scan tool to do. That will help with the diag but will prob cost money to. If not the old school way is use a smoke machine, and run it from the vent tube at the intake or VSV. And look for smoke. That way is tricky and pretty out there because you would need a machine and have to block off the fresh air tube with pliers.
I would go back and check all connections and make sure there is no torn or cracked hoses, or connectors? Evap can be a little tricky to Diagnosis sometimes. But hopefully in your case it is something simple. Also I don't think in your case this is the problem. But did you remove the gas cap and not tighten it by any chance also?
Good luck
Last edited by Gokracer1; Sep 14, 2008 at 02:59 PM.
JK Freak
Joined: Aug 2007
Posts: 646
Likes: 0
From: Fairborn, Ohio
That is almost correct. All vehicles produced after january first 2008 and most vehicles produced for the 2008 and some from late 2007 are all required to have CAN BUS OBDII enabled BCM's a regular scan tool is not compatible with a vehicle that uses CAN BUS. 
Thats probably why the scan tool didnt read your jeep.
Thats probably why the scan tool didnt read your jeep.
JK Junkie
Joined: Apr 2008
Posts: 2,265
Likes: 0
From: Albuquerque, NM
That is almost correct. All vehicles produced after january first 2008 and most vehicles produced for the 2008 and some from late 2007 are all required to have CAN BUS OBDII enabled BCM's a regular scan tool is not compatible with a vehicle that uses CAN BUS. Thats probably why the scan tool didnt read your jeep.
Thats probably why the scan tool didnt read your jeep.
JK Junkie
Joined: Jun 2007
Posts: 2,467
Likes: 1
From: 4 Corners