If the shift indicator is accurate, we need to check the line pressure in the transmission. You may have a failing front pump or even an issue with the pressure control solenoid.
I do have one other question. You indicated it tries to go into gear. Please explain.
Also, have you scanned the computer to see if there are any diagnostic trouble codes?
I attached the directions for testing line pressure. You will need a pressure gauge that is designed for testing high pressures. Often times a parts store will lend one to you.
Take a look through the directions below and let me know if you are comfortable performing them.
See pics below.
Images (Click to enlarge)
Friday, January 6th, 2023 AT 9:51 PM