Engine won't shut off.
 

So was sitting in park earlier when the car started acting weird and then all at once I lost all HVAC controlles, lost guages and backlighting, all warnings lights came on, no throttle response in gear and engine won't shut off without pulling injector fuse and then pull battery cable to kill the rest of the power. I am at a loss.

No codes, no blown fuses that I have found, solid 14v at the battery when it is running. Will start right up but same problem.

2012 Maxima SV V6 CVT 100,000 miles +/-

Do you have access to a "scope" that could be used to check for a high ac spike that is usually caused by a bad diode function in the alternator? This certainly is most likely electrical. My bet is alternator but it could be a grounding issue as well or even the ecm (but most things you list are more bcm in nature.)

Please let us know what you find.