What engine defect prompts US probe of 1.4 million Hondas?

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Connecting Rod Bearing Failures Prompt US Probe of 1.4 Million Honda Vehicles

The U.S. National Highway Traffic Safety Administration (NHTSA) has initiated an investigation into over 1.4 million Honda and Acura vehicles due to concerns about connecting rod bearing failures in their 3.5-litre V6 engines, which could result in complete engine failure. This new probe follows previous investigations and a recall by Honda addressing similar issues.
Scope of the Investigation

The current investigation encompasses a significant number of vehicles, including the 2018-2020 model year Acura TLX, 2016-2020 Acura MDX, 2016-2020 Honda Pilot, 2018-2020 Honda Odyssey, and 2017-2019 Honda Ridgeline. These vehicles are equipped with the specific 3.5-litre V6 engine that is the focus of the NHTSA's inquiry.
Previous Actions and Concerns

This probe is a continuation of earlier scrutiny, as NHTSA had already investigated 1.4 million Honda vehicles in 2024 for serious engine issues. This earlier investigation was prompted by a recall initiated by Honda in November 2023. The recall aimed to address a potential manufacturing defect in the engine crankshaft, which could lead to premature wear and seizure of the connecting rod bearing.
Assessment of Safety Risks

The NHTSA is opening this new investigation to conduct a more thorough evaluation of the issue's scope and severity, particularly in vehicles not covered by the prior investigation. The agency has received 414 reports detailing the problem, and the high volume of engine failure reports in vehicles outside the scope of previous actions highlights a potential safety risk that requires further assessment.

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What engine defect prompts US probe of 1.4 million Hondas?

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