Good morning,
There is no connection between the two issues.
The fact it will not go into reverse could be low fluid or a clogged filter in the transmission. How long has it been since you changed the transmission fluid and filter?
As far as the door locks, the actuators are common for failing. What door is not working?
I attached a wire diagram for you to view. If you have a voltmeter, we can do some checks for the system.
Roy
https://www.2carpros.com/articles/automatic-transmission-problems
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Sunday, November 25th, 2018 AT 9:03 AM