The National Highway Traffic Safety Administration (NHTSA) has launched an investigation into more than 1.4 million Honda and Acura vehicles over defective connecting rod bearings that can cause complete engine failure. The probe targets 3.5-liter V6 engines in popular models including the Honda Pilot, Odyssey, and Ridgeline, along with several Acura vehicles.
The investigation underscores growing safety concerns about widespread engine problems that could leave drivers stranded or create hazardous situations on busy roadways.
Federal regulators opened the probe on August 20. They are focusing on the J35 V6 engine used across multiple Honda and Acura model lines. The investigation covers 2016–2020 Acura MDX vehicles, 2018–2020 Acura TLX models, 2018–2020 Honda Odyssey minivans, 2016–2020 Honda Pilot SUVs, and 2017–2019 Honda Ridgeline pickup trucks.
NHTSA has received at least 414 complaints involving engine failure tied to the defective connecting rod bearings. Seven incidents involved crashes or fires, but officials reported no injuries or deaths connected to the engine problems.
The investigation represents a significant expansion beyond earlier safety actions. NHTSA previously conducted probes that led to recalls affecting 249,000 vehicles. The current action covers a much broader range of models and model years with similar defects.
Federal regulators classified the investigation as a preliminary evaluation. This stage allows officials to assess the scope and severity of the safety risks. Investigators are examining whether the connecting rod bearing problems show patterns of sudden engine shutdowns that could endanger drivers and other motorists.
Safety regulators are urging affected vehicle owners to watch for warning signs. These include unusual knocking sounds from the engine, unexpected stalling, or dashboard warning lights. Consumers experiencing these symptoms should seek immediate service at authorized Honda or Acura dealerships.
NHTSA maintains an online complaints system for vehicle owners to report problems directly to investigators. The agency also advises drivers to remain alert for recall notices that may result from the ongoing probe.
The investigation reflects mounting consumer reports about engine reliability issues in Honda and Acura vehicles from recent model years. Federal regulators are responding by examining whether the problems require expanded recalls or other action to protect public safety.