Full Breakdown
Waymo Recalls Nearly 3,800 Robotaxis Over Flood-Road Software Defect
5/13/2026, 8:19:44 AM
Incident Overview
Waymo, Alphabet’s autonomous-vehicle unit, filed a voluntary recall for 3,791 robotaxis equipped with its fifth- and sixth-generation Automated Driving Systems (ADS). The recall targets a software defect that may cause a vehicle to slow but then continue into standing water on higher-speed roadways, a condition that can lead to loss of control and increase crash risk. The issue was highlighted after an unoccupied Waymo robotaxi entered an “untraversable flooded section” of a San Antonio road on April 20, 2026, proceeded at reduced speed, and was swept into Salado Creek. No passengers were aboard and no injuries were reported.
Timeline of Key Events
- Mar 17 2022 – Apr 20 2026 – Production window for the affected ADS units.
- Apr 20 2026 – Flood-road incident in San Antonio; vehicle slowed but did not stop.
- Apr 20 2026 – Waymo deployed an interim software update adding weather-related constraints and map revisions.
- Apr 24/30 2026 – Waymo formally filed a voluntary recall with the National Highway Traffic Safety Administration (NHTSA).
- May 11 2026 – NHTSA issued a recall acknowledgment letter.
- May 12 2026 – Public announcements of the recall appeared in multiple news outlets.
Data & Statistics
- 3,791 vehicles affected, representing the entire fleet of Waymo’s fifth- and sixth-generation ADS units.
- NHTSA estimates a 100 % defect rate for the software in the recalled fleet.
- Waymo reports over half a million trips per week across its service area.
- The recall reveals a fleet size that has nearly doubled since September 2025, crossing the 2,000-vehicle threshold after a $16 billion funding round.
Official Statements & Responses
Waymo’s spokesperson emphasized safety as the primary priority and noted that the company has “identified an area of improvement regarding untraversable flooded lanes specific to higher-speed roadways.” Waymo added that it is “working to implement additional software safeguards” and has refined “extreme weather operations” to limit robotaxi access to flash-flood zones. NHTSA’s recall notice warned that “entering a flooded roadway can cause a loss of vehicle control, increasing the risk of a crash or injury.” Waymo applied an interim fix on April 20 and plans to deliver a permanent over-the-air (OTA) update to the entire fleet.
Criticism & Opposition
Waymo has faced prior safety concerns, including failures to yield to school buses in Austin, illegal passing of stopped school buses, a robotaxi blocking an ambulance in Austin, a cat killed in San Francisco, and a child struck in Santa Monica. Federal investigations into traffic violations and a separate child-strike incident remain open.
On-the-Ground Reports
Local authorities in San Antonio confirmed that the flooded-road vehicle was recovered from the creek after the incident. The company temporarily suspended public rides in the city, later resuming autonomous operations while customer rides remained paused. Video footage from Austin showed a Waymo robotaxi stalled in water-logged traffic.
Why It Matters
The recall underscores the difficulty autonomous systems face in interpreting rapidly changing weather conditions without human judgment. Waymo’s OTA recall model demonstrates a rapid remediation pathway unavailable to traditional vehicle manufacturers, yet the incident fuels broader public and regulatory scrutiny of driverless-car safety.
Conflicting Reports & Gaps
Sources differ on the exact filing date (April 24 vs. April 30) and on the vehicle count (approximately 3,800 vs. 3,791). No timeline has been provided for the final software fix beyond the interim update.
Verbatim Quotes
- “Entering a flooded roadway can cause a loss of vehicle control, increasing the risk of a crash or injury,” — National Highway Traffic Safety Administration
- “Waymo provides over half a million trips every week in some of the most challenging driving environments across the U.S., and safety is our primary priority. 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. 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.” — Chris Bonelli, Waymo spokesperson
- “identified an area of improvement regarding untraversable flooded lanes specific to higher-speed roadways” — Waymo spokesperson
- “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.” — Waymo spokesperson
- “The software may allow the vehicle to slow and then drive into standing water on higher speed roadways,” — NHTSA recall documents
- “The recall covers 3,791 vehicles equipped with the company’s 5th and 6th generation Automated Driving Systems (ADS), which regulators estimate have a 100% defect rate.” — NHTSA (as reported)
What’s Next
Waymo plans to resume passenger rides in San Antonio after reviewing flood-monitoring procedures. The company must submit quarterly status reports to NHTSA on the recall and continues to address separate investigations into school-bus and child-strike incidents while expanding its robotaxi network across ten U.S. cities.
