i dont think the pcm does anything but detect the voltage and send a report when needed, such as 17.0 volts being read. 13.6 or 8 at most is where you really want it to be, anything over 14.0 is not right at all.
Really the car has charged 14.1-14.5 since I got it.
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2005 GPGT- Top Swapped Click me!15.5 @109
2002 GPGT- slow and stock
1993 Oldmobile 88- exploded the diff @158k GPF Resident Flowmaster Troll