Thanks FMMy '17 Sierra has electric PS but I haven't experienced the code so no help. I vaguely remember something about a recall on the PS somewhere but not having any luck finding it.
Edit: Found it!
https://www.consumerreports.org/car-recalls-defects/cadillac-chevrolet-gmc-suv-recall-power-steering-problem-a1811078052/#:~:text=General Motors is recalling 26,847,system to suddenly stop working.