Why do several of my outlets not have power after replacing a GFCI?
How can you tell it's low voltage? What are your points of reference for measuring voltage:  hot to ground or hot to neutral? If hot to neutral, then the low voltage difference could indicate that the hot and neutral both have high voltage on them (e.g. 119.8V between hot and ground and 119.2V between neutral and ground which would show a low voltage difference between hot and neutral of only 0.6V). If the neutral has high voltage, this would most likely indicate an open neutral (i.e. a disconnect somewhere on the neutral leg of the circuit).

If all the other outlets on the circuit are working normally, I would check the ones closest by for a loose white (neutral) wire as they most likely daisy chained to feed the outlet you are currently having issues with. If so, I would guess the issue was probably due to plugging/unplugging something on these outlets that jostled an old "stab-in-back" receptacle connection loose. That said, without seeing your homes wiring diagram, it could potentially be anywhere on the circuit so my suggestion may just be a starting point toward finding the open neutral.