NHTSA complaint #11711605

Owner complaint summary

The engine valvetrain is suspected, specifically an AFM (Active Fuel Management) lifter or related lifter/oil control component. The vehicle and affected components are intact and available for inspection upon request. An unresolved internal engine malfunction presents a risk of sudden power loss, engine damage, or stalling while driving, which could increase the risk of a collision, particularly at highway speeds or in traffic. The issue has been reproduced consistently by the vehicle owner. Diagnostic work has been performed by independent parties, including inspection of the exhaust system, belts, and valvetrain components. Further confirmation by a dealer has not yet occurred. The vehicle has not yet been inspected by the manufacturer, police, or insurance representatives. Independent mechanical inspection and repairs have been performed. No warning lamps or messages were displayed. Symptoms include a delayed chirping/ticking noise beginning approximately 20–30 seconds after engine startup, which is repeatable and changes with engine load and cylinder deactivation behavior.