Because it's integrated into the transmission, accessing it requires some mechanical skill and may involve removing the transmission cover or other components. It is not a simple DIY task. If you need to replace it, it's highly recommended you consult a repair manual specific to your vehicle's year and transmission type (it might be a 3-speed automatic, a 4-speed automatic, or even a different automatic transmission depending on trim level and options). You should also consider having a qualified mechanic perform the repair.
