What does D321 in automatic transmission mean?

1 Answers
Eugenia
07/30/25 8:49am
Automatic transmission D1, D2, D3 are the low-gear modes of the transmission. Automatic D1 is similar to gears 1 and 2 in a manual transmission; automatic D2 is similar to gears 3 and 4 in a manual transmission; automatic D3 is similar to gears 5 and 6 in a manual transmission. Automatic D1 has the largest gear ratio and the strongest torque output, suitable for climbing steep slopes or towing other vehicles; automatic D2 has a reduced gear ratio and torque output, also suitable for climbing or towing; automatic D3 has moderate torque and power output capability, allowing direct engagement while driving to downshift for higher torque output when overtaking, with no noticeable jerk and faster throttle response. The function of the gear limiter in a car is to lock the vehicle in a fixed forward gear without upshifting or downshifting, preventing the transmission from jumping to a higher gear.
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