The gear selector is the part of your gear box that selects gears in an automatic vehicle. The gear selector attaches to the gear stick and consists of a barrel with selector gates in it. This barrel is attached to three selector rods with notched grooves cut out of them. These rods are supported in the gearbox housing.
There are selection forks that are positioned on these rods and slide along with the rods movement. When a selection fork is moved it is pushed towards a gearwheel. The teeth of this gearwheel meet the teeth of a dog-clutch hub. This causes the power to flow to the gear and allows the gear to be selected.
Problems with the gear selector can result in difficulty in finding gears. The gears may also slip, meaning a vehicle that is driving in one gear suddenly changes to another. This may or may not be accompanied with the smell of burning. You may also notice a warning light on the dashboard alerting you to a gearbox problem.
Issues could be caused by faulty solenoids or wiring to the gearbox. Any issues with the transmission should be rectified immediately.