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Human body size, shape, stature, joint range of motion, joint strength, and other factors vary from one person to another. Even for a single person, anthropometric data, such as weights and joint strengths, change with time. Due to this variability, different people adapt different postures to perform the same reach task within a vehicle. Even for the same person and reach task, postures will vary with time. Therefore, it is important to consider the reliability of achieving a reach task within a vehicle to create a better design for vehicle controls, enhance driver safety, and increase the level of accommodation for all types of drivers. In this study, we will present a reliability/probability approach to gain insights into driver reach tasks with uncertainty. Sensitivity levels are found to determine the importance of each joint to the reach tasks. A digital human upper body model with 21 degrees of freedom (DOFs) is introduced to demonstrate the probability approach.