Exhaust System Emission Control Urea Injection System (def) problems of the 2023 Chevrolet Silverado 1500

The contact owns a 2023 Chevrolet Silverado 1500. The contact stated that while driving approximately 65 mph, the vehicle started to lose motive power. There were several unknown warning lights illuminated, and the message that the vehicle would not exceed 55 mph while driving. The contact stated that after driving for several miles, the message appeared that the vehicle would not accelerate to 30 mph while driving. The contact had taken the vehicle to a local dealer, who diagnosed the vehicle and determined that the def tank heater needed to be replaced; gm part number: 85856213; however, the part was on a national back order. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 67,000.