The 2016 Infiniti QX80 represents the pinnacle of family-oriented luxury SUVs, offering a commanding presence and robust V8 power. However, like any complex machine, ownership comes with specific considerations that potential buyers must understand. This guide provides a detailed analysis of the common issues reported by owners, helping you make an informed decision about this full-size three-row SUV.
Understanding the 5.6L VK56VD Engine
At the heart of the 2016 QX80 is a 5.6-liter V8 engine producing 400 horsepower and 413 lb-ft of torque. While this powerplant delivers smooth acceleration and effortless towing, it is not without its specific vulnerabilities. The primary concern centers on the variable valve timing (VVT) system and the timing chain tensioners, which have been the subject of numerous complaints and Technical Service Bulletins (TSBs) over the years.
Variable Valve Timing and Timing Chain Issues
Infiniti issued multiple TSBs regarding the VVT system, specifically concerning the adjustment of the variable valve timing and the replacement of the intake camshaft phaser. Symptoms of a failing phaser include a distinct rattling or ticking noise from the front of the engine, particularly noticeable during cold starts or idle. If left unaddressed, this can lead to more severe internal damage, potentially requiring a costly timing chain replacement or even engine replacement. Regular oil changes using the correct viscosity are critical to extending the life of these components.
Electrical System and Infotainment Quirks
The QX80's technology package, while advanced for its time, presents a unique set of electronic gremlins that have frustrated many owners. The system relies heavily on a central touchscreen and a complex network of modules, which can lead to intermittent failures.
Infotainment Glitches: The navigation system and radio interface are known for freezing, failing to recognize USB devices, or displaying error messages. A factory reset often resolves these issues, but they can persist.
Warning Light Syndrome: It is not uncommon for various warning lights to illuminate on the dashboard without an accompanying malfunction, such as the Electronic Stability Control or AdvanceTrac warnings. These typically require a visit to the dealer for a system reset or module reflash.
Key Fob Malfunctions: The smart key fob has been reported to fail intermittently, preventing the vehicle from starting or unlocking, often due to a weak battery or internal circuit board failure.
Suspension, Steering, and the "Death Wobble"
Comfort is a priority for the QX80, but the air suspension system in certain configurations can develop leaks over time. A failing air spring or compressor can lead to a noticeably harsh ride or the vehicle sitting unevenly. Furthermore, the steering assembly has been flagged for potential power steering fluid leaks, which can create a mess under the hood and lead to a loss of assist if not addressed.
Handling the Front Strut Bearing
A more serious handling-related issue involves the front strut bearing. A defective bearing can produce a grinding or popping noise during turns and, in severe cases, can lead to a dangerous condition known as "death wobble." This violent shaking of the steering wheel requires immediate attention, as it compromises vehicle control. Inspecting the strut assembly for play or noise during routine maintenance can prevent this issue.
Interior Wear and Tear
Leather-trimmed surfaces, while luxurious, are prone to showing wear and tear, particularly on the front seats. Cracking and fading are common after several years of exposure to sunlight. The center console, despite its premium feel, has been reported to develop creaks and rattles over time, often attributed to the plastic fasteners used in the assembly.
