When you put the car in reverse do the reverse lights come on? If not, I would start by checking the fuses DCT3, DCT2 under the hood and fuse TCU,B/UP LP1 and the cluster fuse and if there are okay, I would change out the transmission mode switch or range sensor which the instructions to change and location of the sensor are in the images below.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Here are the fuses in the wiring diagram so you can see what I am talking about and the fuse locations as well. IF the fuses are good and the reverse lights come on, we should run the codes.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
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Monday, January 30th, 2023 AT 10:15 AM