The US opened a federal investigation into whether Tesla Inc.’s partial-automation system marketed as Full Self-Driving is defective after multiple crashes, one of which resulted in a fatality.Most Read from BloombergA Broken Oil Pipeline Plunges South Sudan’s Capital Into ChaosInside the ‘Utopias’ of Mexico CityOne City’s Plan to Re-Link a Neighborhood That Robert Moses DividedCities Look to AI to Flag Residents’ Trash and Recycling MistakesChicago Should Consider Furloughs,

The National Highway Traffic Safety Administration is investigating Tesla's Full Self-Driving software in 2.4 million vehicles.

The National Highway Traffic Safety Administration said it was looking into what Elon Musk’s electric car company called the full self-driving system.