I have a 2002 XJ8 all was good and driving down road and all dash warning lamps came on restricted performance, speedo and tac quit and wouldn't shift from park to drive once I got home and tried moving car. Left sit for half-hour....started car and all lights gone....runs perfect??? Thoughts?

 

Chafed harness upsetting the network(s)?

Bad connection somewhere?

It'll be easier to find if it keeps doing it but intermittent = tough.