Hello Krystin,
For a proper trouble shooting read the fault codes for the transmission to narrow down the issue and feed back.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
If all other gears can be selected then the selector lever and cable are good,transmission fluid level is good as you mentioned then we might have shorted electrical component not allowing the PCM to control the transmission. example reverse solenoid in valve block,or clutch discs, bands.
Check our guide for automatic transmission problem:
https://www.2carpros.com/articles/automatic-transmission-problems
Please feed back what happens with you.
thank you.
.
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Monday, March 25th, 2019 AT 12:34 PM