Fixing “No Bus” check engine light for ‘01 Cherokee

[‘01SilverXJ]

This check engine light and “no Bus” visual first showed up about a week ago. I took apart the dash and cleaned and re plugged in the cluster and it went away. Just today, about a week after fixing it the first time, the “No Bus” check engine light came back on. Any ideas on what the problem is and how to fix it? Thanks

[KarmaKannon1]

Mine says no bus when the computer is disconnected. Might check those connections and the grounds.