Tesla is recalling 12,963 electric cars built and sold in the United States this year, because they may lose power while driving. According to official documents submitted to the National Highway Traffic Safety Administration (NHTSA), the affected vehicles have been fitted with high-voltage battery contactors that have a faulty solenoid. The problematic solenoid may force the contactor to suddenly open due to a poor coil termination connection, which stops the flow of electricity from the main battery to the electric motor or motors.