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Discussion Starter #1
I have a 2007 Jeep compass 4x4 Sport that I recently purchased that appears to be stuck in 4wd. I would very much appreciate anything anyone could share with me that might help me troubleshoot what I need to replace:

There are no error lights on
  • 4wd light comes on and off when the 4wd Lock lever is engaged
  • 4WD! light comes on when the ECU fuse is pulled
  • Traction control light works but is not on
  • ABS light works but is not on
  • Check engine light works but is not on
However - the vehicle definitely seems to be stuck in 4wd - I can feel it binding when turning etc. This does not change with 4wd light on or off.
  • Reversing to try to release a mechanical bind had no impact
  • There is an almost "propane" smell in the vehicle - probably dripping or burning gear oil
  • The front differential was replaced 6,000 miles before I bought it
  • The rear differential gets hot when being driven
  • There are no errors in the ODB2 record
One possible issue is that the tires are slightly mismatched (and have been since I bought it)?

I have seen others with a similar challenge posting in other places but nobody has posted a resolution that I can find. There are some issues that are somewhat similar with speed sensor issues but those seem to universally throw a Traction Control error.

I am hoping there is some way to release the ECC somehow and free the rear end?
Are there troubleshooting steps for the PTU / RDA etc?

Any help would be greatly appreciated

Super Moderator
534 Posts
Pull the ECC fuse, then you will be in FWD mode and see if that gets rid of the problem.
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