I work on developing steering systems. If you have lost power steering and are having issues like described and the vehicles accessory systems are staying on, it sounds like an issue with your high voltage system (rare from water damage, but murphys law must be observed) . The low voltage...
Maybe if you have the CoPilot360. I would believe that the Pitch and Yaw are being measured by the radars, probably the front radar in control of the ACC. I could be wrong though. Still would need that 6"cluster though.