2006, Jeep Commander, transmission overheating, water pump and thermostat replaced. Transmission dipstick missing. What could the problem be?

Question editerd for clarity.

Question moved to model category, however, there are 3 engine sizes for that model.

VEHICLE 2008 Jeep Commander
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Parts

Accessories

3.7L Gas; Engine
4.7L Gas; Engine
5.7L Gas; Engine
That part from AUTOZONE!!

2008 Jeep Commander Vehicle/Transmission Speed Sensor AutoZone

https://www.autozone.com/engine-management/vehicle-transmission-speed-sensor/jeep/commander/2008
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P0717 OBD-II Trouble Code: Input/Turbine Speed Sensor ...

YourMechanic https://www.yourmechanic.com > Articles
P0717 is a diagnostic trouble code (DTC) for "Input/Turbine Speed Sensor No Signal". This can happen for multiple reasons and a mechanic needs to diagnose ...

Missing: Commander ‎' Show results with: Commander

Code P0717 Jeep Input Speed Sensor 1 Circuit No Signal

AutoCodes https://www.autocodes.com > p0717_jeep
Repair Information for P0717 Jeep code. Learn what Input Speed Sensor 1 Circuit No Signal means, location and how to repair?

Similar to this

https://jeepspecs.com/wj-generation/wj-jeep-parts-equipment/transmission-input-output-speed-sensors/

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Larry Ng is our Jeep Expert, plus he owns one and will be along shortly, but this may explain it on a different model. They share fuse boxes but not all have the EATX relay.

EATX Relay missing

ChryslerMinivan.net https://www.chryslerminivan.net > threads > eatx-relay...
EATX relay supplies power to the TCM and solenoid block; it's only used with a 4-speed transmission so yours is a 3-speed. There are other relay slots that ...

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you should replace the radiator with one that has an extra row of core,they all have this problem.

If has dipstick check level in neutral with engine running, no dipstick take plug out on right side of transmission while engine running should trickle out of plug hole.

check transmission fluid level could be low if vechicle has 60000 time for fluid filter change.if all is good have transmission shop do diagnostic check using scanner check transmission see whats causing light to flash on.

There's always the possibility that the water managed to get into the ECU and fry the system, but I'd hope fervently not. Pull the dipstick. If the fluid looks black, or is shiny, you might be in for a bad day. Drain the transmission oil out if it is black (a $10 fluid vacuum pump from Wal*Mart works wonders here), and pour in the right amount of ATF fluid. It might be that it burnt the fluid so much it changed viscosities, trying to crank the engine and the car forwards? I wouldn't know, but see if that helps.

The computer will not allow the vehicle to start because transmission is overheating and it will damage it.

take off/loosen the clip on the highest hot hose to expell any trapped air in water system..(when engine is hot)poss just trapped air...

try the water pump - first - make sure the radiator is really full - take the cap off cold and fill - if it looks full - start and run 8 minutes or so - then fill it up - look at ur fan belt - is it tight - tight is about how much pressure u use to make a firm hand shake with little movement - any movement over about an inch is loose - when the jeep warms up the belt can slip and not even make a noise - - new materials don't always squeal. - then be sure ur water pump is ok - they go slowing - the fins wear down - one more thing is the radiator - u don't say how many miles or what maintenance schedules you have or not so that's it for now

when the transmission overheat light (this is for the fluid) comes on the transmission control module pulls the trans out of OD to try and cool it down, this is called failure mode strategy, it is built into the programming of the control module, the signal from the trans is most likely incorrect, but the module doesn't know that, replace the transmission fluid temperature sensor.