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Hi Randy, my name is***** you tell me what has been checked or replaced so far to repair this problem?
The first thing you should do is check the fuses in the top of the overvoltage protection relay. The relay is under the hood at the right rear. I've attached a picture below. The relay is tucked behind the tall relay with the knob on top. Let me know what you find.
Sorry for the wait I had a busy day at the shop and could not reply. Next I would test the voltage at the overdrive solenoid on the transmission. Measure the voltage at the solenoid with the key on engine running. If you have no voltage to the solenoid you have a fault with the control unit or the wiring. If you do have voltage to the solenoid you will need to do a voltage test at the solenoid while road testing the car to see if the voltage changes as you get to cruising speed.