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.
Gear not changing, can only change Gear when the engine is off. The problem stared with the body shaking when when pulling away in gear one, now the gear is not shifting while engine idles.