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NHTSA opens new probe into Honda engine defects

© A. Krivonosov
Over 1.4 million Honda and Acura vehicles face investigation in the US over potential V6 engine failures.
Michael Powers, Editor

The US National Highway Traffic Safety Administration (NHTSA) has launched a new investigation into more than 1.4 million Honda and Acura vehicles over concerns of potential engine failure. The issue involves premature wear of connecting rod bearings in 3.5-liter V6 engines, which could lead to complete engine seizure.

In an August 20 letter, the agency confirmed it had received 414 complaints covering Acura TLX (2018–2020), MDX (2016–2020), Honda Pilot (2016–2020), Odyssey (2018–2020) and Ridgeline (2017–2019).

Honda had already recalled 249,000 vehicles in late 2023 over similar defects in crankshafts. That prompted a probe into 1.4 million cars in 2024. With new complaints emerging outside that recall scope, NHTSA has now reopened the case to assess the full extent and safety risks.

The regulator emphasized that widespread engine failures represent a significant hazard if vehicles stall or lose power unexpectedly. Depending on the outcome, Honda may be forced into an expanded recall campaign in the US.