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Are all of the gears backlighted on the PRND display in the dash? Meaning, instead of the one you select having a black box around it, they ALL have a black background? If so, you should have stored faults in the TCM. Your best bet is going to be to scan the fault memory, otherwise we are just guessing. Stuck in 3rd gear is "limp home mode" and indicates an electrical fault.
Let me know if you get the faults scanned.