Hi,
The idea that it won't reverse, and it was struggling in drive (engine revs/moves slowly) leads me to think either the transmission fluid is low or there is a pressure-related issue.
Before you present this for warranty consideration, check the transmission fluid level and condition. If it is low or excessively dirty, they may deny a claim.
I attached the directions below related to checking the transmission fluid level and condition. Take a look through the directions and let me know if you are comfortable performing them. Note that this doesn't have a traditional dipstick to check the level, so the directions are required.
Additionally, here is a link that explains in general how to do it. It may be helpful for you, but again, the directions specific to the vehicle are listed below.
https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid
Let me know.
Joe
See pics below. Note: The directions are for a Malibu with a 2.0L Turbo engine. If you have something different, let me know.
Images (Click to make bigger)
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Tuesday, October 10th, 2023 AT 7:40 PM