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P0973 --- 1-2 Shift Solenoid (SS) Control Circuit Low Voltage TCM -
DTC P0973 in Automatic Transmission - 4L60-E/4L65-E
I don't recall seeing that one before. I looked around here and found nothing. Looked on the net and found nothing related to Corvettes but a lot of Diesel trucks and Hondas.
Looks like a dealer visit is in order for proper diagnostics. Did find one case that turned out to be a simple neutral safety switch, but that is highly unlikely in your case.
Best of luck and please let us know what happens. )