code was caused by the transmission control module losing battery power. This code will stay in memory for a long time, so it would likely be from the battery replacement!
I have 1 more question, when you say the indicator lights go haywire, what is going on with them and which ones are coming on. Do the gauges drop off?
I think you are going to have to get the entire system checked for fault codes and let me know all the numbers. We need to find out if there are any bus communication fault codes. I am suspecting now that your instrument cluster has an internal intermittent failure causing it to take down the bus communication system. Could you get these code/codes to me? Thanks!