Transmission will not stay in gear

We need to start with checking for codes.

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

Once we know if there are codes we can go in a different direction.

Also, we need to check the fluid level and condition of the transmission. If it is not correct we need to drain and fill it. I attached the process. Let me know what happens with this and we can go from there. Thanks

Good morning,

I would start by changing the fluid. If the fluid has broken down, it will not allow the pump to produce pressure.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Beyond that, if the fluid is good, it is an internal failure and the transmission has to be replaced.

https://www.2carpros.com/articles/automatic-transmission-problems

Roy

Transmission Fluid Drain and Refill

Material
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Draining
1. With the vehicle in NEUTRAL, position it on a hoist.

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2. NOTE: If an internal problem is suspected, drain the fluid through a paper filter. A small amount of metal or friction particles may be found from normal wear. If an excessive amount of metal or friction material is present the transaxle will need to be overhauled.

Remove the transaxle drain plug.

Refill

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1. Using a small amount of thread sealant on the threads, install the transaxle drain plug.
Tighten to 25 Nm (18 ft. lbs.).
2. Fill the transaxle with clean automatic transmission fluid.
3. Start the engine and run through all the gears and check fluid level.