Waymo has issued a voluntary recall of thousands of its autonomous vehicles following an incident in which one of its robotaxis drove into a flooded area in San Antonio, Texas.

The incident occurred on April 20, when an empty Waymo vehicle entered a flooded road despite road conditions that should have prompted the autonomous system to avoid the area. The vehicle was subsequently swept into a creek as a result of the flooding.

The recall affects thousands of Waymo's autonomous vehicles, though the company has not specified the exact number of vehicles involved or provided details about what specific technical modifications will be made to address the issue.

Waymo's autonomous vehicles use a combination of sensors, cameras, and mapping technology to navigate roads safely. The April incident suggests the vehicle's systems failed to properly detect or respond to the hazardous flooding conditions.

The recall is voluntary, meaning it was initiated by Waymo rather than mandated by federal safety regulators. The company operates robotaxi services in several U.S. cities as part of the growing autonomous vehicle industry.