Automatic transmission: It switches gears without the driver having to do anything.
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Its automatic activation controlled by the vehicle's computer (ECU) generally prioritizes fuel's efficiency. It is very convenient to have one to drive in cities as there are usually traffic jams there.
The transmission gear does not fully engage all the gears. It's stuck at gear 3 and makes noise, though I'm moves but it takes a bit longer to select the gear from initial start