2006 GMC Envoy Denali XL P2101 Code: Throttle Failure and Engine Won't Start

My 2006 GMC Envoy Denali XL suddenly lost all throttle response, and the check engine light illuminated. I safely pulled off the road and turned off the ignition. When attempting to restart, the vehicle would crank but not start. Using an OBD2 scanner, I detected a P210,