CAN YOU MANUALY REST THE COMPUTER SO IT WILL SHIFT
You can to a hard reset by just disconnecting a battery cable and let it set for a few minutes then reconnection it. But I don't think that is your problem, it could be a crosscircuited wiring in the shift circuits or a bad gear selector switch. Have you checked for any codes? There could also be a failure to communicate from ECM to BCM, or failed circuit buss.
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