2015 GMC Canyon stability control problems

I was taking a corner to go up to my road and then my power steering chime went off posting power steering has failed, then a message saying the stability control isn't functional. I drove into a small ditch because I couldn't turn my wheel. I was at a slow speed. I turned off the truck, and the warning went away. This has happened at least 8 times and have taken it to two dealers and the final dealer said I couldn't drive the truck until I replace the rack & pinion assy.

While driving across parking lot at 8 MPH, vehicle lost power steering control without warning. Engine and other electronics continued to operate, however vehicle power steering and traction control warning lights were illuminated. I stopped vehicle, turned off ignition, and restarted, power steering and traction control lights went off and vehicle returned to normal operation.