The contact owns a 2019 Ram 1500. The contact stated while driving approximately 70 MPH, a warning chime sounded. The contact stated that there were no warning lights illuminated while the chime was sounding. The contact slowed down and heard an abnormal sound underneath the vehicle before the wheels locked up. The vehicle stopped on the roadway independently without the brake pedal being depressed. The contact stated that the engine was running; however, the vehicle failed to respond as needed. The vehicle was towed back to her residence. The contact had not taken the vehicle to a local dealer or independent mechanic to be diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was unknown.