Codes P0092 and p00c9

Check engine light is on not flashing, stabilitrak is disabled, power loss to engine is flashing. 96,660 miles on vehicle!

Some say it is your fuel pressure regulator and some say it is your fuel pump going bad. One code I believe says high voltage and other one saying low voltage. I am lost and no dealership seems to know but have a 50/50 ideal but don't want risk it.