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Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
Can I get the year, make, and model?
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We can try a ECU reset first but I just do not believe this is going to work. Disconnect the battery cables and hold them together for one minute then reconnect. This will reset all modules. Let me know those results prior to me getting into wire testing at the ECU connector.
So I assume the reset you asked how to do failed to resolve the issue?
The transmission control module and the electronic control module are mounted together at the right front of the engine compartment. Is that what you were asking about?
ECM close the fender, TCM close to the engine.
Below is an image of the tool needed.