Hi,
It could be related to the park/neutral position switch on the transmission. It could be a faulty switch, wiring issue, linkage adjustment issue, and so on. However, it does sound like the switch is bad.
I attached the wiring schematic below. (see pics 1 and 2). I had to cut the pic in half to make it readable. I did overlap them so you can follow from one to the next. If you look at the bottom left of pic 2, you will see the switch.
The remaining pics are a continuity test on the switch. Let me know if you are comfortable doing it. Additionally, here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
Let me know if this helps or if you have other questions
Take care,
Joe
See pics below.
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Thursday, September 16th, 2021 AT 9:26 PM