Transmission will not shift into reverse or overdrive?

Hi,

The first thing I suggest is to scan the can-bus for diagnostic codes to see if there are any that are related to the transmission. The issue could be the result of a few things including a pressure solenoid, shift solenoid, and so on.

Here is a link that explains how to scan for all codes (CAN):

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Next, if it is a solenoid related issue, I would think the torque converter shift solenoid (solenoid A) would be related, but I don't believe it has anything to do with reverse.

I attached directions below for replacing solenoid A. The first pic below shows the location of solenoid B and C.

The primary reason I recommended scanning is because it will become a guessing game if we aren't sure. It can get expensive and time consuming.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.