Alphabet’s Waymo has issued a voluntary recall affecting 3,791 robotaxis in the United States due to a self-driving software issue that could cause vehicles to enter flooded roadways, particularly those with higher speed limits. The recall was announced by the National Highway Traffic Safety Administration (NHTSA) on May 12, 2026.
This marks one of the largest recalls in Waymo’s history and highlights ongoing challenges in handling extreme weather conditions for autonomous vehicles.
The Triggering Incident in San Antonio
The recall stems from an incident on April 20, 2026, in San Antonio, Texas, during extreme weather and heavy flooding. An unoccupied Waymo robotaxi encountered a flooded section of roadway with a 40 mph speed limit. Although the vehicle detected the water, it proceeded at a reduced speed instead of fully stopping or rerouting, leading it to drive into the flooded lane. The car was later swept into a waterway by floodwaters.
No passengers were in the vehicle, and there were no injuries or crashes reported. Following the event, Waymo temporarily paused operations in San Antonio and began investigating similar scenarios across its fleet.
Details of the Software Issue and Affected Vehicles
The recall targets vehicles equipped with Waymo’s fifth- and sixth-generation Automated Driving Systems (ADS). The software flaw may fail to adequately recognize or respond to untraversable flooded roads, increasing the risk of loss of control, hydroplaning, or collisions.
Waymo has already implemented interim measures, including:
- Tightened weather-related operational constraints
- Updated high-definition maps to better flag flood-prone areas
- Modified scope of operations in regions at elevated risk of flash flooding
A full software remedy is under development and is expected to be delivered via over-the-air (OTA) updates.
Waymo’s Response and Safety Commitment
Waymo described the action as a voluntary recall to address an “area of improvement” in handling flooded higher-speed roadways. A company spokesperson emphasized that safety remains the top priority and noted that operations continue normally in other cities with the enhanced restrictions in place.
The company stated it is actively refining extreme weather operations and limiting access to areas prone to flooding while finalizing the permanent fix.
Industry Context and Implications
This recall comes as Waymo expands its robotaxi services across multiple U.S. cities, including Phoenix, San Francisco, Los Angeles, Austin, and recently San Antonio and Atlanta. The fleet size disclosure (3,791 units) provides rare insight into the scale of Waymo’s operations, suggesting the recall covers both active ride-hailing vehicles and those in testing or backup.
Autonomous vehicle companies continue to face scrutiny over edge-case performance in adverse conditions like heavy rain, fog, and flooding. While Waymo maintains one of the strongest safety records in the industry, incidents like this underscore the complexity of replicating human judgment in unpredictable real-world scenarios.
NHTSA continues to monitor Waymo’s performance, with this being the latest in a series of software recalls for the company (previous ones addressed issues like low-speed collisions with barriers and school bus interactions).
What This Means for Riders and the Future of Robotaxis
- Current riders: No immediate action is required. Vehicles will receive the software update automatically.
- Availability: Service in affected areas may have temporary weather-based limitations.
- Broader impact: The event could influence regulatory discussions around autonomous vehicle deployment in regions prone to severe weather.
As competition in the robotaxi space intensifies — with players like Tesla’s Cybercab, Cruise, and Zoox also scaling — robust handling of edge cases will be critical for public trust and regulatory approval.
For the latest updates on this recall, check the official NHTSA recall page or Waymo’s safety transparency reports. Waymo continues to invite feedback from riders to improve its technology.
Stay tuned to vfuturemedia.com for more on autonomous vehicles, robotaxi developments, and the future of mobility.
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