Honda recalled 635,808 vehicles over steering software that can cut power assist

American Honda recalled 635,808 vehicles in the United States because their electronic power steering software can put the system into failsafe mode and disable power assist, according to its Part 573 safety recall report for campaign 26V721. The recall covers 75,598 Acura TLX from model years 2021 to 2025, 177,100 Acura MDX from 2022 to 2024 and 383,110 Honda Pilot from 2023 to 2025.

Honda submitted the report on 29 October, and NHTSA’s recall record shows the documents loaded on 10 November.

The report said the supplier, named as Robert Bosch Automotive Steering, developed software with an error in a Driver Attention Monitor road-condition compensation calculation. Under specific conditions the software can perform a floating-point division with a zero denominator, triggering an internal error, and it was configured to respond to that error by disabling power steering assist. Steering effort then increases, which Honda said may raise the risk of a crash.

The chronology on page 8 of the report says Honda received its first report on 29 November 2021. From August 2023 to August 2025 further reports came in, but no issues were found with returned parts “due to the deletion of error codes by the dealer or supplier”. The supplier identified the failure through market-return analysis on 22 August 2025, and Honda recreated it in December 2025 by analysing dashcam footage. Honda decided on the recall on 22 October 2026; by then it had recorded 146 warranty claims, one injury report and no reports of a death.

Dealers will reprogram the steering control unit with corrected software. Owner letters are planned for 14 December. Honda said the affected models are no longer in production.