NHTSA complaint #11662953

Owner complaint summary

My 2019 RAM 1500 Big Horn/Longhorn 3.6L V6 (VIN: [XXX] ) experienced a sudden and catastrophic engine failure without warning while driving. The vehicle shut off unexpectedly on the highway and would not restart. There were no prior dashboard warning lights, low oil pressure indicators, or error messages before the incident. A full diagnostic revealed severe mechanical failure in cylinder 1, including piston-to-valve contact and 40% leak-down with compression at 50 psi. This damage rendered the engine inoperable and required a complete replacement. Prior to the failure: The vehicle was regularly maintained using synthetic oil, following the manufacturer's recommended intervals (between 6,500–10,000 miles). The oil life indicator was followed, and the truck was never low on oil or pressure. A Customer Satisfaction Notification for PCM (Powertrain Control Module) reprogramming was never completed due to the dealer’s system being down on two separate service visits. Despite following proper maintenance and attempting to comply with the manufacturer’s recall-like notice, the engine failure occurred without any warning or indication. The dealership and warranty provider have attempted to deny responsibility, blaming maintenance intervals without proof that it caused the failure. This is a serious safety concern as the engine shut down at highway speed, placing me and others at risk. I am requesting NHTSA investigate this issue and whether PCM logic, a known defect, or improper diagnostics at the dealership contributed to the failure. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)