Transmission issue, when it is in park it shows it is in reverse?

Transmission acting up. When I hook up my scanner it seems that when it's in park it shows it's in reverse, when in neutral shows drive and so forth. But when I out it in reverse it goes back and when in d it drives, its erratic shifting but I also have no transmission codes only intelligent sensor and alternator codes. I hooked up my ohmmeter and it's fine 14.3 or so. The information display flashes and sometimes does not come on, so I think the charging is not stable but the battery tested good with load. I looked at the bsd and it looks fine. I deleted the codes, and it keeps coming back. There is a mismatch when I look at gear positions. Sometimes it's the alternator code other times it says it's not seeing or getting message from the intelligent sensor.