This could be a shift solenoid, or you have a gear range sensor going out, can I ask when you put the truck in reverse does the backup lights go on? If not, I would start by checking the fuses which. This guide can help you, be sure to have the key on when checking:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
If the fuses are okay and the reverse lights are not going on I would replace the gear range sensor, here is how in the images below. Check out the images (below). Please let us know what you find.
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Wednesday, March 22nd, 2023 AT 4:34 PM