Steering that turns heavy without warning is the failure Honda described to federal regulators in a recall of 635,808 U.S. vehicles. A software setting can drop the electronic power steering system into a failsafe mode, switch off the assist and light the warning lamps while the effort needed at the wheel climbs. Honda Pilot SUVs, Acura MDX SUVs and Acura TLX sedans are all in the group.
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The faulty code came from a supplier, Robert Bosch Automotive Steering, and Honda needed nearly five years from its first report of the problem to a recall decision.
Pilot, MDX and TLX: model years and counts
Honda’s recall covers three nameplates. Claims Journal’s wire report lists 2021-2025 Acura TLX sedans, 2022-2024 Acura MDX SUVs and 2023-2025 Honda Pilots, and gives the combined figure of 635,808. The breakdown sits in Honda’s Part 573 filing with NHTSA, which counts 383,110 Pilots, 177,100 MDX models and 75,598 TLX sedans. The Pilot alone therefore accounts for roughly three of every five vehicles in the action.
Honda’s recall numbers for the filing are KQB and TQA, and the company submitted the report on Oct. 29, 2026, a week after it decided a safety defect existed.
A division by zero in the Driver Attention Monitor code
The filing assigns the root cause to software written by Robert Bosch Automotive Steering LLC. An error sits in the calculation that compensates for road conditions in the Driver Attention Monitor feature, and under specific conditions that calculation divides by zero. The resulting internal error triggers the response the software was configured to give, which is to disable power assist. Honda describes the cause as an improper software configuration rather than any worn or broken steering hardware.
What a driver notices is described plainly in the filing. The EPS warning lights come on, assist disappears and steering effort rises, which Honda says may reduce controllability and raise the chance of a crash or injury. Honda’s engineers found that the fault appears only under certain operating conditions, and in February 2026 they confirmed it occurs when the vehicle is driving straight, which is part of why it stayed hard to catch for so long.
From a 2021 report to an October 2026 decision
Honda received its first report on Nov. 29, 2021. Between August 2023 and August 2025 more reports arrived, and Honda worked on them with the supplier, but returned parts showed no faults because error codes had been deleted by the dealer or the supplier. The supplier identified the failure through market-return analysis on Aug. 22, 2025. In December 2025 Honda recreated the problem using dashcam footage and analysis, and further market research ran through April, June and the fall of 2026 before the company determined on Oct. 22 that a safety defect existed.
From May 22, 2022, to Oct. 22, 2026, the filing logs 146 warranty claims and one injury report, with no reported deaths. The same three nameplates were in the news on other defects before: WardsAuto reported a February 2025 recall of up to 294,612 Pilot, MDX and TLX vehicles for an engine-control software error, and TFLcar covered a June 2025 recall of 259,033 of them over a brake pedal pivot pin that was not staked during assembly.
Set against the fleet, 146 warranty claims over about four and a half years works out to roughly one claim for every 4,300 vehicles, a low rate that helps explain why individual reports looked like isolated, unrepeatable glitches. The filing’s account of the investigation points the same way: parts returned from the field showed nothing because the error codes were gone, and it took the supplier’s market-return analysis, then the dashcam recreation, to show the fault was reproducible and tied to the software rather than to hardware wear.
The two earlier recalls on these nameplates involved different parts. The February 2025 action covered Acura MDX Type-S, Honda Pilot and Acura TLX Type-S vehicles with V6 engines, where an engine control unit error could cause stalling or sudden power loss, and Honda decided on that recall on Jan. 16 and notified dealers on Jan. 28. The June 2025 action split into 184,253 Pilots, 67,448 MDX models and 7,332 TLX sedans, and Honda blamed a supplier, Otsuka Koki, along with staffing, training and a malfunctioning QR code tracking system. Owner notification for that one was planned for July 28, 2025.
Reprogramming the control unit, with letters due Dec. 14
Dealers will reprogram the electronic power steering control unit with corrected software at no charge. Honda notified dealers on Oct. 30, 2026, and the filing sets owner notification for Dec. 14, 2026. Until the letters go out, owners can check a VIN or license plate on the federal recall page, which also says that recently announced recalls may not yet list every VIN and recommends checking regularly.
The records name no Honda spokesperson, so the account above rests on Honda’s own filing and the supplier attribution inside it. The open question for the 635,808 owners is timing, since the filing puts the first owner mailing roughly six weeks after the Oct. 30 dealer notice.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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