Chrysler Concorde 2000, 65,000mi, V8

Yesterday afternoon I was thrilled (not) to see my Check Engine light come on, and then find that the transmission was not shifting correctly: it
will not shift up but the low gears and reverse are OK. The car has approx. 65K miles on it, and was running just fine until the CE light came on.
Also, speedometer not working. Checked transmission fluid and appears to be fine (full and clean).
Anyone have an idea what would cause this? ? ?
Any assistance appreciated.