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What does automatic transmission D123 mean?

2 Answers

Ramos

08/28/25 4:41am

Automatic transmission D123 refers to the low gear mode of the transmission. Here are the relevant details: 1. Different transmission gears: When in D gear, the vehicle's transmission can automatically shift up and down, while in 1st, 2nd, and 3rd gears, manual operation is required to fix the gear, allowing the engine to deliver different output power. 2. Automatic transmission models: Automatic transmission models do not require the driver to manually shift gears. The vehicle automatically selects the appropriate gear based on driving speed and traffic conditions. The driver only needs to control the accelerator pedal. The automatic transmission uses planetary gear mechanisms to shift gears automatically according to the degree of accelerator pedal pressure and changes in vehicle speed.

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MacPeter

09/10/25 3:09am

On automatic transmission cars, you may notice gears labeled D1, D2, and D3. These are actually auxiliary gears designed for special driving scenarios. D1 locks the transmission in the lowest gear (usually first gear), resulting in high engine RPM but maximum traction. It's ideal for descending steep slopes, providing engine braking to protect the brake system. D2 limits shifting between first and second gears, suitable for moderate slopes or snowy roads to enhance wheel control and prevent skidding. D3 operates within the first three gears, offering more flexibility for daily driving by avoiding excessive gear changes—such as in city traffic jams—to save fuel. Normally, I drive in D mode, but these are manual options that can be engaged via buttons or levers as needed. Avoid prolonged use to prevent unnecessary engine strain. Simply put, they give you more control and are highly practical.

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