The agency has previously investigated earlier versions of Smart Summon, which is meant to let a Tesla vehicle park itself or fetch a driver via remote app command.

The National Highway Traffic Safety Administration's is focused on safety concerns related to the "Actually Smart Summon" (ASS) feature.

The National Highway Traffic Safety Administration is investigating 2.6 million Tesla vehicles over crashes involving the "Actually Smart Summon" feature. The feature lets users move cars remotely. The probe examines the feature's maximum speed,

The National Highway Traffic Safety Administration is probing about 2.6 million Teslas after regulators discovered that a feature on multiple vehicle models was tied to crashes. The feature, known as "Actually Smart Summon" is intended to have the car park itself and pick up its owner using a button on the Tesla app.

A potentially faulty driverless car feature found in roughly 2.6 million Tesla cars on U.S. roads highlights the risks associated with CEO Elon Musk's plans to roll out unsupervised Full Self-Driving this year.

Tesla is under investigation by the NHTSA once again, this time over the automaker's "Actually Smart Summon" feature, which allows users to recall their Tesla to their location remotely, for example across a parking lot.