won't go in reverse

If there is no drive in reverse there will probably be a shift solenoid or the gear range sensor. lets run the codes to see what comes up here is a guide to help you.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

Here is the shift solenoid locations I would et a rebuilt valve body it fixed my friends car BTW. Check out the diagrams (Below). Please let us know what happens.