The 1999 Jeep Grand Cherokee represents a pivotal moment for the iconic SUV, marking the transition to the second-generation WJ platform that refined the formula established by its predecessor. While celebrated for its capable off-road prowess and refined V8 options, this specific model year is not without its share of mechanical gremlins and design quirks that have defined the ownership experience for two-plus decades. Understanding the nuances of potential 1999 Jeep Grand Cherokee problems is essential for current owners looking to maintain reliability and for prospective buyers weighing the purchase of a used example.
Common Mechanical Issues and Component Wear
Delving into the mechanical heart of the 1999 Grand Cherokee reveals several systems prone to wear and failure over time. The automatic transmission, particularly the 42RE paired with the 5.2L V8, is frequently cited for its susceptibility to harsh shifts and premature failure if not serviced meticulously with the correct fluid and filter intervals. The transfer case, a critical component for four-wheel-drive operation, is another area of concern, with potential for fluid leaks and internal bearing wear that can manifest as grinding noises or a complete loss of low-range gearing.
Electrical Gremlins and Sensor Failures
As the vehicle ages, the sophisticated electrical architecture of the WJ platform can become a source of frustration. Owners often report issues with the Body Control Module (BCM) and various sensor failures, leading to intermittent problems with dashboard lights, cruise control malfunctions, and erratic behavior of the climate control system. The infamous instrument cluster backlight failure is also a common complaint, where the gauges become difficult to read at night due to a burnt-out incandescent bulb or a failing cluster assembly.
Design and Build Quality Concerns
Beyond the mechanicals, the 1999 model year highlights some inherent design choices that have not aged gracefully. The interior plastics, while functional, are prone to cracking and developing a hazy, sun-faded appearance, particularly on the dashboard and center console. The soft-top roof on convertible models requires careful maintenance; improper cleaning or exposure to extreme temperatures can lead to premature deterioration of the vinyl material and its surrounding frame.
Suspension and Steering Wear
The front suspension design, featuring an independent layout with a combination of ball joints and control arms, is another area where wear and tear become evident. Over the years, the lower ball joints and tie rod ends can wear out, leading to clunking noises over bumps and a decline in steering precision. Furthermore, the steering box and its associated linkages are not immune to leakage, which can result in a vague steering feel and requires prompt attention to ensure safe handling.
