Jeep Issued A 2 Page TSB (Technical Service Bulletin) 08-048-05 (9/1/2005) Pertaining To 2005 Liberty/Cherokee Models. Subject Of Said Bulletin:
“Rear Axle Fluid May Contaminate The Differential Mounted Rear Wheel Speed Sensor”
This is for Jeep Technicians to read and see how to diagnose and repair complaints from customers that have an ABS warning, or brake warning, or MIL (Malfuction Indicator Light) that stays on and explains what to check and how to fix.
Looks like, on vehicles that need it, the rear differential cover leaks and “contaminates” the differential mounted rear wheel speed sensor and needs to be removed and resealed and a new 56041393AA wheel speed sensor and 05086337AA sensor o-ring installed, fluid topped off, and some other details.
The dealer can do the check and repair for you. If you’re DIY, I couldn’t find a copy to pass along and if you can’t search and find it, maybe a friendly Jeep dealer (or Dodge or Chrysler ?) will make you a copy. Keep in mind, this bulletin is for their technicians.