Mag rides are expensive so I was just saying check if any of the magnetic ride special sauce is leaking. If they are you need new shocks and they are $500 a piece or more.
Your scan tool will only read the ECM; it won’t be able to read any of the computers in the truck such as the BCM, stab control modules, side detection modules, entertainment systems, collision detection and airbags, etc. those modules throw their own codes and have their own test routines.
Sometimes you need to recalibrate modules such as if you replace a mag ride shock it’s good to do the zero procedure which only a bi-directional scanner can do when it talks to the SCM.