hi i'm bill
welcome to just answer
please remember I am NOT there in front of you! my answers are based on your information.

the code means the engine computer has lost the communication bus, which is what all teh different computers in the jeep communicate to each other with, the communication bus originates in the instrument cluster and cluster failure was a common item in the older jeeps (cherokee and wrangler use the same cluster so it was a common failure on both) BUT before replacing a cluster jeep always suggested replacing the right cluster connector pigtail,the part number should be 05016261AA but may have been superseded over time, if this doesn't fix it i would suggest starting with a replacement cluster, and POSSIBLY a reman engine computer.

the problem with the older communication bus faults is it is nearly impossible to determine an exact failure if only 1 module is throwing a code, the engine computer is the only one that had the ability to set a loss of communication code back then when we changed to a faster CAN bus in 2004 things got easier to diagnose since every module had the ability to set loss of communication codes.

the right pigtail is the one closest to the radio, if you order a cluster from a reputable rebuilder the mileage is programmed at the rebuilder,(you can understand the legal aspects of anyone being able to reprogram mileage i am sure) if you use a used one the mileage will be that of the jeep it is removed from since mileage is stored in the cluster.