Re: Dealer having to replace the PCM
This sometimes happens with bad grounds. If a major ground comes loose, the circuit energy tries to return through smaller weaker grounds burning them out. I would be concerned that something else may have burned as well.
That being said, ECUs do burn out though and they are not cheap new, >$1000. Luckily, anytime I've had to replace one, I was able to find it at a junk yard for substantially less. I don't have a 12+ jeep so I can't tell you where it is specifically.