NHTSA Complaint #11711246 — 2016 ACURA MDX

I was driving my Acura MDX(2016 7900 miles) on a multi-lane highway, the vehicle experienced a sudden and significant loss of engine power without prior warning. This occurred during normal traffic conditions and reduced the vehicle’s ability to accelerate and maintain speed, creating a safety risk for my family and surrounding vehicles. After the loss of power, a rattling/knocking noise from the engine became apparent. A check engine light appeared after the initial event which later went away. The vehicle was first inspected by an authorized dealer, who recommended replacement of spark plugs and later a timing belt as part of the diagnostic process. These actions did not address the underlying issue. The vehicle was subsequently inspected by an independent repair facility. The independent mechanic confirmed internal engine damage by finding metal shavings in the oil and diagnosed rod bearing failure, requiring complete engine replacement. The failed engine is available for inspection upon request. The independent mechanic also referenced an Acura/Honda technical service bulletin related to rod bearing failures affecting similar engines and model years. The vehicle has been routinely serviced at authorized Acura dealerships, including regular oil changes, prior to the failure. No external damage, misuse, or lack of maintenance was identified during the inspection by the dealership. The issue was later inspected by the manufacturer’s authorized dealer. The manufacturer declined assistance, stating the failure was not considered a defect. There were no warning lamps, messages, or noticeable symptoms prior to the initial loss of power.