This is the fourth NHTSA safety investigation currently looking at Tesla.

Tesla is the target of yet another federal safety probe, the fourth currently open by the National Highway Traffic Safety Administration's Office of Defects Investigation. Today's trouble concerns the automaker's "Smart Summon" and "Actually Smart Summon" features, which allow Tesla drivers to remotely control their vehicles via a smartphone app.

At least in theory, that is. In practice, NHTSA says it's aware of multiple crash allegations "where the user had too little reaction time to avoid a crash, either with the available line of sight or releasing the phone app button, which stops the vehicle’s movement."

...read more at arstechnica.com