Hi,
Based on your description, it doesn't sound like a fluid level issue, but anything is possible. What to do is this. Place the vehicle on a flat surface. Place it in park, start it, and allow the engine to reach operating temperature. Shift through the gears and back to park. This guide can help show you.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
With the engine running, remove the dipstick (which should be on the passenger side under the hood, near the firewall) wipe it and then repeat to get an accurate level.
Pay attention to the condition of the fluid. For example, what color is it? Does it have a smell to it?
Next, I need to know if the check engine light stays on when the engine is running and if there is any smoke coming from the vehicle that could be what you smell.
Let me know.
Joe
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Friday, January 22nd, 2021 AT 2:27 PM