Waymo Pushes OTA Fix to 3,791 Robotaxis After a Flooded-Road Failure
Waymo filed a voluntary software recall with NHTSA covering 3,791 robotaxis after an empty vehicle drove into floodwater in San Antonio and was swept into Salado Creek. The fix ships over the air.
TL;DR — Waymo is recalling 3,791 robotaxis after an empty vehicle in San Antonio slowed down and drove into a flooded road in late April, getting swept into Salado Creek; the company is pushing an over-the-air software fix and paused service in the city.
The case for autonomy rests on machines not making the careless judgment calls humans make. So the relevant detail in this incident is the failure mode: in late April 2026, a Waymo robotaxi in San Antonio detected a flooded road, reduced speed — and drove into it. The fix is software, delivered fleet-wide over the air, which is both the strength and the complication of a software-defined vehicle.
The incident
Per the recall report, an unoccupied Waymo encountered "an untraversable flooded section of a roadway" on April 20. Rather than stopping or rerouting, it proceeded into the water at reduced speed and was swept into Salado Creek, as TechCrunch reported. No injuries — because the cabin was empty, which is the only reason this registers as an engineering defect rather than a casualty.
Waymo paused operations in San Antonio and, on May 12, filed a voluntary software recall with the National Highway Traffic Safety Administration.
Scope and root cause
The recall covers 3,791 vehicles running Waymo's fifth- and sixth-generation Automated Driving System, per the NHTSA filing. The defect, in the company's wording:
"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."
Decoded: on faster roads, the system would slow down rather than stop at water it could not cross. NHTSA noted Waymo is still "developing the final remedy for this recall."
| The recall at a glance | |
|---|---|
| Vehicles affected | 3,791 |
| Systems | 5th & 6th-gen ADS |
| Trigger incident | April 20, 2026, San Antonio |
| Filed with NHTSA | May 12, 2026 |
| Remedy | Over-the-air software update |
A recall without a service center
This is where a robotaxi recall diverges from a 2008 Takata airbag campaign: no owner has to drive anywhere. The fix goes out over the air to the full fleet — no service appointment, no loaner, no parts backlog. An initial update has already imposed restrictions "at times and in locations where there is an elevated risk of encountering a flooded, higher-speed roadway."
That is the operational upside. The semantic cost is that "recall" now spans both a physical brake-line defect and a logic gap that did not account for standing water — and the term loses precision in the process.
The edge-case problem
Waymo is the most cautious and most data-rich operator in the segment, and it still deployed a system that mishandled a flooded street. That is less an indictment of Waymo than a measure of how long the tail of edge cases runs. Floods, construction zones, downed lines, debris in a fast lane — the physical world keeps generating scenarios absent from the training data. Autonomous systems no longer fail at the average case; they fail at the anomalous one, which remains the domain where human judgment still holds an edge.
FAQ
How many Waymo robotaxis were recalled and why?
Waymo recalled 3,791 robotaxis running its fifth- and sixth-generation self-driving system. The reason was a software flaw that, on higher-speed roads, would let a vehicle slow down and drive into standing water it couldn't cross, rather than stopping — the same behavior that swept an empty Waymo into Salado Creek in San Antonio.
Do owners need to bring the cars in for the Waymo recall?
No. Waymo owns and operates the fleet, and the fix is delivered over the air. No vehicle needs to visit a service center; an initial update already restricts driving near flooded higher-speed roadways while Waymo finalizes the full remedy.
Was anyone hurt in the San Antonio Waymo flood incident?
No. The vehicle that drove into the flooded road and was swept into Salado Creek on April 20, 2026 was unoccupied, with no passenger inside.
Sources: TechCrunch, Electrek, CNBC.
Image: 9yz, CC BY-SA 4.0, via Wikimedia Commons.
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