...for interested parties, an update:-
Whilst in the process of removing the glove box to disconnect and extract the ECU to send for diagnosis and repair, I came across a YT vid showing how to reset the ECU of an Infiniti G series housing a VQ37ED. A carefully times series of actions on the start button and the accelerator pedal.
I tried it and the ECU really did reset and both my scanners were then able to connect. So the ECU was either in an error state where communications could not happen, or an error state had been thrown which instructed it not to communicate. I suspect and hope the former.
The only code in the ECU was a U0101 - Lost communication with TCM - Permanent.
I think this is a false negative thrown by a stuttering ECU which put the car into limp. Either way, it's cheaper and quicker to send the ECU off for a check than to diagnose loss of communication between TCM of an auto box and ECU for which the most common causes of the fault are broken wires, corroded wires, corroded fuse contacts, bad grounding and RODENTS!
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