[GTP Dad]

Unfortunately this does sound like a transmission failure. However, since the transmission is controlled by the PCM you may have a problem with the PCM or wiring to the transmission from the PCM. If the CEL is on then there must be an issue somewhere and the scanner should pick it up especially if it relates to the engine or transmission. Take the car to a tranny shop and get it scanned with a trans capable scanner to see what is actually going on.