“The reports have often been characterized as ‘phantom braking’ by consumers,” the agency said in aposted to its website Thursday. “Complainants report that the rapid deceleration can occur without warning, at random, and often repeatedly in a single drive cycle.”
NHTSA said it will “determine the scope and severity of the potential problem” and “fully assess the potential safety-related issues.” After NHTSA opened the probe into how Teslas on Autopilot handles crash scenes, the company beamed an over-the-air update to its vehicles that sought to improve how the system detects police cars and fire trucks. NHTSA asked the carmaker in October to justify its decision to make the software change without filing a recall.