Software Bug, Not Mechanical Failure, Triggers Honda Steering Recall
American Honda Motor Co. is recalling 635,808 vehicles due to a software configuration error in the electronic power steering (EPS) system that can cause the assist to fail, according to filings with the National Highway Traffic Safety Administration. The recall covers specific 2023-2025 Honda Pilot, 2022-2024 Acura MDX, and 2021-2025 Acura TLX models. Unlike the recalls of old, this one isn’t about a faulty part wearing out, but a line of code that can trigger a system shutdown.
The Mechanics of a Digital Failure
Electronic power steering systems use electric motors to provide assistance, a departure from older hydraulic systems that used fluid actuators. A key advantage of many EPS systems, unlike full ‘steer-by-wire’ setups, is that they typically maintain a direct mechanical connection between the steering wheel and the wheels. This means that even if the electric assist fails, the car can still be steered, albeit with significantly greater effort.
The Honda issue is rooted in a specific software flaw. According to the automaker’s recall report, the software may perform a floating-point division with a zero denominator, triggering an internal error. The EPS software was incorrectly configured to respond to this error by disabling power steering assist entirely. This failure mode is known as a ‘fail-safe,’ but in this case, the safe state is the loss of assistance. When the system enters this mode, the EPS warning lights illuminate, and steering effort increases, which can reduce vehicle controllability and increase the risk of a crash or injury.
A Recall Defined by Data
The breakdown by vehicle is precise: 383,110 2023-2025 Honda Pilots, 177,100 2022-2024 Acura MDXs, and 75,598 2021-2025 Acura TLXs. As of Oct. 22, Honda had logged 146 warranty claims and one injury report related to the issue, with no reported deaths. The problem was first reported to Honda in November 2021, but the company did not determine it posed a safety risk until Oct. 22, 2026, five years later.
This recall is tracked under NHTSA campaign number 26V721 and Honda’s own campaign numbers KQB and TQA. The remedy is straightforward: dealers will reprogram the EPS control unit with updated software at no charge to the owner. The timeline for the fix is also set in stone. Vehicle identification numbers (VINs) for affected models became searchable on the NHTSA website on Nov. 11, and owner notification letters are scheduled to be mailed beginning Dec. 14.
Software vs. Steel: A New Era of Recalls
This recall highlights a growing trend in the automotive industry where software, not mechanical hardware, is the source of safety concerns. The technical reality is that modern vehicles are increasingly complex networks of code controlling critical systems. As ever, the detail that matters is that this specific failure is tied to a calculation error, not a physical defect like a cracked steering column or a leaking hose.
Comparing it to historical mechanical recalls offers perspective. A past Honda recall for a similar steering issue on the 2025 Acura RDX (NHTSA 25V582) affected 17,334 vehicles and was estimated to have a defect rate of just 0.3%. In contrast, Honda’s filing for this current recall estimates that 100% of the 635,808 vehicles in the population carry the problematic software. This suggests a systematic error introduced during the software development or calibration process, rather than a manufacturing anomaly that affects only a small fraction of units.
Safety in the Mechanical Age
The safety risk, while serious, is mitigated by the fundamental design of the EPS system. The fail-safe mode that disables power assist, while making the vehicle harder to handle, does not result in a total loss of control. The driver retains the ability to steer the car, albeit with substantially more force required. This is a crucial distinction from a complete brake failure or unintended acceleration, where the primary control is entirely lost. The advisory from Honda and NHTSA does not include a “Do Not Drive” or “Park Outside” warning, indicating that while the risk is elevated, the vehicle remains operable under the conditions of the failure.
For owners, the path forward is clear. The detail that matters is the free software update. The process is simple: once notified, owners can contact a Honda or Acura dealer to have the EPS control unit reprogrammed. The company has also established a line for owners to call with questions, at 1-866-784-1870. The fix is a reminder that in the digital age, a car’s most critical systems can be updated over-the-air or in a quick dealer visit, a stark contrast to the era of waiting for replacement parts to be shipped and installed.
Owner notification letters are scheduled to be mailed beginning Dec. 14.
Sources
- Power steering
- Honda recall of 600K+ vehicles warns drivers not to use some models
- Ford Explorer Side Airbag Burn Probe, Honda/Acura Power Steering Recall, and Hyundai Airbag Control Unit Recall
- If Your Honda Pilot's Steering Goes Heavy on a Straight Road, This 635,808-Vehicle Recall May Be Why
- Dangerous Steering Problem Prompts Massive Recall Of 635K Hondas, Acuras – AOL
- Honda to recall more than 600,000 US vehicles over issues with steering assist software, NHTSA says
Photo: Kwamitsey (CC BY 4.0)
