Hi,
Fuse 14 sends power directly to the TCM. Disconnect the TCM and inspect the connector for damage, pins at the connector that are bent, broken, corroded, or anything out of the norm. Check for wiring that has insulation worn or missing. Additionally, with the connector disconnected, remove the fuse and test for continuity to ground where the fuse makes contact. If the battery is connected, you will find 12v on one side and the other should have no power and no continuity to ground. If it has continuity to ground, then the power supply wire (red wire with a white tracer) is shorted to ground.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
I attached the wiring schematic related to the transmission control (TCM). Note: The TCM is internal in the transmission (see pic 5). At the rear of the transmission is a wiring harness connector. From there, wiring goes into the transmission and to the components. If nothing is found externally, we will need to drain the fluid and inspect the wiring in the transmission.
Let me know what you find.
Take care,
Joe
See pics below.
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Saturday, December 11th, 2021 AT 11:10 PM