I went to the Dealership and bought 9 quarts of trans fluid at $7.15 per quarts, not as bad as the Kia dealership who wants $12 per quart.

Hyundai said that they never change the filters, only a system flush. That might be ok if they are serviced on schedule, but when who knows the last time it was changed, it's probably a good idea to also change the filter correct?

If the Temp Sensor is bad, that will be around $55 to replace. Is there anyway to test or inspect this part?

I'm going out to check the fluids now, I will let you know what I find.

 

Coolant seems good, I'm sure it's due for a flush but it isn't bad.

Just for kicks, I disconnected the battery, reconnected and cleared the codes.
Checked for codes nothing. Drove 100 feet freeze frame and nothing.
Let it warm up for about 1 min, drove 100 feet, car died freeze frame shows the same thing with same % for each, same trouble codes.
I pulled the dip stick to see if the tranny fluid was warm, it was outside very cool temperature..
If it was over heating the sensor, the fluid should be too hot shouldn't it?
Or possibly the actual sensor itself has gone bad?

 

It's a really weird problem. Maybe you should go ahead and replace the temperature sensor. Maybe the whole car shuts down because the sensor registers overheated.