Waymo recalls thousands of robotaxis for surprising reason

On April 20, an unoccupied Waymo robotaxi encountered a flooded section of road in San Antonio during extreme weather. Instead of stopping, it slowed down and kept going. The vehicle was swept into Salado Creek. It had to be recovered from the waterway days later.

Ten days after that incident, Waymo filed a voluntary recall. On May 12, the recall became public. And the reason behind it raises questions that go well beyond one vehicle on one flooded road in Texas.

What the Waymo recall covers and why NHTSA is involved

Alphabet-owned Waymo filed a voluntary recall with the National Highway Traffic Safety Administration covering 3,791 robotaxis across approximately 10 U.S. cities on April 30, according to TechCrunch. The recall affects vehicles equipped with both Waymo’s fifth- and sixth-generation autonomous driving systems.

According to NHTSA documents, the core issue is that Waymo’s robotaxis were slowing, but not stopping, when encountering flooded roads that they could not traverse, TechCrunch confirmed. The vehicles detected the hazard but continued forward rather than halting and rerouting.

NHTSA noted that Waymo is still developing the final software remedy for the recall, meaning the fix has not yet been fully deployed.

Waymo’s exact statement and interim response to the recall

“We have identified an area of improvement regarding untraversable flooded lanes specific to higher-speed roadways, and have made the decision to file a voluntary software recall with NHTSA related to this scenario,” Waymo said in a statement, according to Reuters.

“We are working to implement additional software safeguards and have put mitigations in place, including refining our extreme weather operations during periods of intense rain, limiting access to areas where flash flooding might occur,” the company added. Waymo also paused operations in San Antonio following the incident, Reuters confirmed.

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Interim measures already deployed to the fleet include new weather-related constraints, updated mapping restrictions, and tighter operational limits during heavy rain events, according to Electrek.

The full software remedy will be delivered over the air, meaning no vehicles need to visit a service center. Waymo controls and operates every vehicle in its fleet directly, which means OTA completion rates approach 100%.

The recall reveals limits of autonomous driving in severe weather

The flood incident is a specific example of a broader challenge the autonomous vehicle industry has not yet solved: how self-driving systems handle unpredictable real-world conditions that fall outside their training data.

Heavy rain, flooding, snow, and rapidly changing road hazards can reduce sensor accuracy and complicate the machine learning models that autonomous vehicles depend on to navigate safely.

Waymo’s vehicles rely on a combination of lidar, cameras, radar, and high-definition maps. Flooding introduces a dynamic hazard that does not appear on any pre-loaded map and that can change within minutes. The April 20 incident showed that detecting flooding is not the same as correctly responding to it. The vehicle slowed. It did not stop.

That distinction matters enormously as Waymo expands into cities with more volatile weather patterns than its early markets in Arizona and California. San Antonio, where the incident occurred, experiences flash flooding regularly during spring and summer storm seasons.

The company has announced plans to grow its footprint further into similar environments.

Alphabet-owned Waymo filed a voluntary recall with the National Highway Traffic Safety Administration, covering 3,791 robotaxis across approximately 10 U.S. cities.

Baker/Getty Images

Waymo’s growth story and mounting regulatory scrutiny

The recall lands at an unusual moment for Waymo. The company is simultaneously at the peak of its commercial ambition and under more regulatory scrutiny than at any previous point in its history.

Waymo raised $16 billion at a $126 billion valuation earlier in 2026, according to Electrek. The company now delivers 500,000 paid robotaxi rides per week across 10 U.S. cities and is targeting 1 million weekly rides by year-end, Electrek confirmed. That growth, by most measures, has made Waymo the most commercially advanced autonomous vehicle operator in the world.

But the same expansion that produced those numbers has also produced a string of regulatory actions. NHTSA is separately investigating a January incident in which a Waymo vehicle struck a child near a Santa Monica elementary school, causing minor injuries.

The National Transportation Safety Board is also investigating a January incident in which Waymo vehicles, in violation of Texas state law, passed a stopped school bus with its warning lights activated. The flood recall is Waymo’s second voluntary recall since February 2024.

Key figures from the Waymo flood recall and company operations:Vehicles recalled: 3,791, covering fifth and sixth generation autonomous driving systems, according to TechCrunchIncident date: April 20, San Antonio; voluntary recall filed April 30; recall made public May 12, according to BenzingaWhat happened: Vehicle detected flooding but slowed rather than stopped; was swept into Salado Creek; no injuries; car recovered days later, Electrek confirmedFix method: Over-the-air software update; no service center visit required; final remedy still in development, TechCrunch notedWaymo weekly rides: 500,000 paid rides per week across 10 U.S. cities; targeting 1 million by year-end, according to ElectrekWaymo valuation: $126 billion following a $16 billion funding round in 2026, Electrek confirmedActive NHTSA investigations: Child injury in Santa Monica in January; school bus violations in Texas in January, according to ReutersHow to read Waymo recall for investors and autonomous vehicle industry

The “recall” label carries more alarm than the mechanism warrants. Waymo identified a problem within 10 days, paused operations in San Antonio, filed a voluntary recall, and is deploying a fix over the air to its entire fleet.

No customer has to act. No vehicles sit unpatched. That process is faster and more complete than most recalls in the traditional automotive industry.

What the incident does reveal is that autonomous vehicle systems still carry edge-case vulnerabilities that can produce serious consequences.

Detecting a hazard and correctly responding to it are two different engineering problems. Waymo solved the first, but not the second, when it comes to high-speed flooded roads.

At 500,000 rides per week and growing, the frequency at which its vehicles encounter low-probability scenarios is rising steadily. Whether the final software remedy fully closes that gap is the question that will matter most over the coming months.

Related: Waymo brings traffic to a standstill in major American city

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