Tesla is being investigated by the US government after reports that the firm's self-driving cars had broken traffic laws, including driving on the wrong side of the road and not stopping for red lights.
The National Highway Traffic Safety Administration (NHTSA) revealed it was aware of 58 reports where the electric cars committed such violations.
An estimated 2.9 million cars equipped with full self-driving tech will fall under the investigation.
Tesla, whose boss Elon Musk recently became the world's first half-trillionaire, has been asked for comment.
The NHTSA's preliminary evaluation will assess the scope, frequency, and potential safety consequences of the 'Full Self-Driving (Supervised)' mode.
This mode allows the cars to make lane changes and turns, but drivers must always be alert to take over at any time.
According to the NHTSA report, there were six crashes caused by cars stopping at a traffic light before setting off while the light remained red. Four of those resulted in injuries.
The traffic authority noted that Tesla had taken steps to address issues of cars going through red lights at a specific intersection in Maryland, where problems had been repeatedly observed.
Additionally, the agency will investigate reports of vehicles unexpectedly entering the opposite lane when making turns. Some incidents reportedly provided little notice to drivers or opportunity to intervene.
Tesla is already facing an investigation from the NHTSA regarding issues with the locking mechanisms of vehicles, following cases where children reportedly became trapped inside Model Y cars.
Recently, Elon Musk announced the introduction of lower-cost models for two of Tesla's popular vehicles as the company seeks to remain competitive against cheaper electric vehicles from Chinese manufacturers.
Moreover, in July, Musk unveiled plans for a new political party, the America Party, aiming to compete with the traditional Republican and Democratic parties.
