Make sure the transmission is full of fluid and if so with no codes I would replace the input shaft speed sensor which can cause the problem of the transmission not shifting. Check out the images (below). Please let us know what happens.
Images (Click to enlarge)
May 8, 2023 at 12:47 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.