Is it possible to run full Hydro on a 2012+ with no codes or dash lights?

 

Sure, but it’s not a good idea if it’s driven on the road often. The idea behind hydro assist is that if you lose component of your power steering (pump, belt, hydro line, ram, etc), you still have a hard linked steering that is safe to use on the road. With full hydro, if any single component fails, you and anyone around you is screwed.