Tesla is issuing a recall for more than two million vehicles in the United States, marking the company’s largest-ever recall, to address safety issues related to its Autopilot advanced driver-assistance system. This move comes after the National Highway Traffic Safety Administration (NHTSA) raised concerns about the system’s ability to ensure drivers’ attention, potentially leading to an increased risk of accidents.

The recall involves a comprehensive update to the Autopilot software system, aiming to enhance controls to prevent driver misuse. Tesla’s filing indicated that the existing software might not be sufficient in preventing misuse, necessitating these additional safeguards.

The NHTSA has been investigating Tesla’s vehicles for over two years, examining whether the electric automaker has implemented adequate measures to ensure drivers remain attentive while using Autopilot. The agency, during a U.S. House hearing, commended Tesla for agreeing to the recall, emphasising that the primary concern was drivers not consistently paying attention when the Autopilot system is engaged.

The safety probe was initiated in August 2021 after reports of fatal crashes involving Autopilot use caught the attention of regulators. Acting NHTSA Administrator Ann Carlson expressed the urgency to address the issue promptly.

Tesla’s recall is not limited to the U.S., as Transport Canada also announced a recall affecting 193,000 vehicles to address Autopilot-related concerns. The stance of other regions, such as China, on demanding a recall remains unclear at the moment.

Tesla’s shares experienced little change in response to the recall announcement.