- The issue involves a solenoid fault and ECU software logic.
- Defect could lead to over-revving and sudden power loss.
- Affected LX600s were built between late 2024 and late 2025.
Even the most refined and reliable luxury SUVs can stumble. Lexus is warning owners of new LX600 models that they may face an increased risk of crashing, and in rare cases, even a potential fire. The culprit is not a fringe component but the 10-speed automatic transmission fitted to the brand’s flagship SUV.
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A recall notice issued through the National Highway Traffic Safety Administration (NHTSA) states that one of the solenoids responsible for controlling gear shifts could fail. If that happens, the transmission ECU and the engine ECU may not communicate properly. Due to a software logic issue, the system may also fail to suppress an over-revving condition in certain gears.
Beyond possible transmission damage, the issue could cause a loss of motive power while driving, increasing the risk of a crash. If the transmission housing is damaged, it may also leak fluid, raising the risk of a fire.
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Lexus says 4,374 examples of the 2025-2026 LX600 equipped with the Aisin-sourced 10-speed automatic are included in the recall. The affected SUVs were built between November 22, 2024, and December 8, 2025.
How The Fault Was Identified
Toyota first identified a potential issue involving the transmission ECU’s control logic in October, which triggered a detailed investigation. Engineers collected and analyzed remote vehicle data from impacted models in Japan before expanding the review to other markets in January. They also examined data from vehicles that had experienced linear solenoid failures.
“The additional data identified vehicles with linear solenoid failures and showed that certain subsequent customer usage patterns could potentially lead to an over-revving condition that would not be suppressed because of the software issue,” Toyota said in its NHTSA filing.
The automaker said it cannot estimate what percentage of vehicles actually contain the defect. It added that it is not aware of any field reports or warranty claims related to the issue.
Owners of affected LX600 models in the US will be notified of the recall in April and asked to take their vehicle to a Lexus service center. Dealers will update the transmission ECU software at no cost, which is intended to resolve the problem.
