2005 Dodge Grand Caravan - Trans code

My caravan is not changing gears. Got a PO700 CODE, so I chnaged out the Transmission Control selonoid . Still not changeing gears.
What else should I look at?

PCM fault P0700 indicates that there is a fault present in the Transmission control module, you need a scan tool that is capable of communicating with the TCM so you can review the fault codes.