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Do you know which trouble codes are stored?
For the warning lights to come on, there has to be codes. Are you sure your scan tool can communicate with the TCM?
Will your tool allow for monitoring the trans and coolant fluid temp sensors to see why the fan is running at high speed?
Any sensor failure on the transmission can send a vehicle into limp mode and quite a few on the engine as well.
Did you check the trans fluid temp sensor reading while using the scan tool?
The computer has to be getting a high temp reading from the engine or trans to turn the fan on high.
EATX is short for electronic automatic transmission.
I tried, but I do not believe I can figure this out not in person. Going to opt out and let another try.