What does D+- mean in an automatic transmission?
2 Answers
Automatic transmission D+- represents the manual mode of an automatic transmission, indicating that the vehicle is equipped with a semi-automatic transmission that combines both automatic and manual shifting functions. Here is some relevant information about semi-automatic transmissions: 1. The reason for the development of semi-automatic transmissions: Traditional automatic transmissions offer superior operability and driving comfort but lack the engaging driving experience of manual transmissions. Semi-automatic transmissions were developed to address this issue, combining the advantages of both automatic and manual transmissions. 2. The function of D+- in automatic transmissions: In addition to automatic shifting, D+- also provides manual shifting capability, freeing drivers from the limitations of traditional automatic transmissions. This allows drivers to enjoy the freedom of manual gear shifting while still benefiting from the comfort of an automatic transmission.
Those D+ and D- symbols are quite common on automatic transmission cars. When I first started driving, I didn't understand them either, but later learned they indicate manual shift mode. Normally in D gear, the car shifts automatically, but if you push the + symbol, it upshifts to increase speed, and pushing the - symbol downshifts to enhance torque, giving you more control. For example, downshifting when climbing steep hills gives the engine more power, prevents brake overheating on long descents, and quick upshifting helps accelerate when overtaking. Of course, cars are smart—if the RPM gets too high, they automatically protect the transmission from damage. Beginners should start with D gear and try manual mode later for more driving fun once they're familiar.
