i had this problem too with the ABS and brake light, i changed the sensor in the top of the rear diff and the problem went away for a little while so i thought that fixed it yet a month latter it came back again, investigating again i found that the connector to the sensor had a broken wire in it , i cut off the connector and soldered and heat shrinked a replacement plug with about 20cm of cable, been good for the last 8 months now, jeep used cheap low quality wire in all the kJ looms and the wires fracture internally causing intermittent issues, its not the only fractured wire i have found I had another broken one in the engine bay related to a different issue, they are a pain in the ass to find but from what ive read quite a common problem.
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