The contact owns a 2015 Chevrolet Silverado 1500. The contact stated while driving at various speeds, the gauges on the instrument cluster were fluctuating, and the power steering warning light and the stabili-trak warning light lights were illuminated. The contact pulled over to the side of the road and allowed the engine to cool down. The contact stated that upon restarting the vehicle, the vehicle responded as needed. The contact stated that the failure had been occurring mainly in hot weather. Additionally, the contact stated that if the vehicle was not pulled over to the side of the road until the vehicle cooled down, the vehicle gradually lost motive power. The contact stated that the failure had been occurring intermittently. The vehicle was taken to several independent mechanics, where the failure could not be duplicated. The vehicle was taken to the dealer, where the same assessment was made. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA Campaign Number: 18V586000 (Steering); however, the VIN was not included. The manufacturer was not notified of the failure. The failure mileage was approximately 30,000.