What does M+ and M- mean in an automatic transmission?

[StAlivia]

M+ and M- are features found in vehicles with a manual-automatic transmission. The manual mode (M) of a manual-automatic transmission includes M+ and M-, allowing for both automatic and manual shifting. To use the manual mode, move the gear lever to the position between M+ and M-. Pushing the lever toward M+ shifts up one gear, while pushing it toward M- shifts down one gear. Additional information: 1. A manual-automatic transmission car refers to a vehicle equipped with a "manual-automatic" transmission, which combines both manual and automatic shifting modes. These transmissions have prominent +/- indicators, allowing the driver to manually switch gears by moving the lever to this position. 2. Structurally, a manual-automatic transmission is still an automatic transmission. Therefore, it retains some drawbacks of conventional automatic transmissions, such as relatively higher fuel consumption and limited modification potential. Additionally, since these transmissions are often imported, their cost is significantly higher than standard transmissions, leading to higher overall vehicle prices.

[McOmar]

When I used to drive an automatic transmission car, I frequently utilized the M+/M- function, which is the manual shift mode allowing drivers to manually control gear shifts. During long downhill drives on mountain roads, using M- to downshift to a lower gear enabled engine braking, reducing the need to constantly apply the brakes and preventing overheating risks—making the ride much smoother. When overtaking, M+ upshifting provided quicker acceleration and more responsive engine performance. Remember, it’s not entirely the same as a manual transmission but rather an auxiliary function that offers additional gear control on top of the D (Drive) mode. Some drivers overlook this feature, relying solely on throttle input, but using M mode can actually improve fuel efficiency. Car manufacturers designed this function to provide greater driving flexibility, especially in complex road conditions. I’ve personally avoided multiple rear-end collision risks thanks to it—a highly practical skill. From novice to experienced drivers, I always recommend friends to practice using it to boost driving confidence.

[MacMiranda]

In automatic transmission vehicles, M+ and M- represent the manual mode control buttons: M+ is used to upshift for faster acceleration, while M- downshifts to provide greater torque, suitable for climbing steep slopes or overtaking. This is not a professional racing feature but assists drivers in optimizing control under normal road conditions, such as manually adjusting gears to prevent slipping on snowy or muddy roads. In daily driving, I often use it during traffic jams with frequent acceleration and deceleration to prevent excessive wear on transmission components from constant gear shifts. The manufacturer's intention was to enhance safety and efficiency, so don't treat it as mere decoration. Based on experience, I recommend practicing at low speeds first; once familiar, it can significantly reduce fuel consumption and accident risks. Remember to maintain balance and avoid overuse to prevent excessive engine load.

[VanAlaina]

The M+ and M- in automatic transmissions are essentially manual gear shift buttons, allowing for semi-automatic control. I most frequently use them when driving downhill on mountain roads, employing M- to downshift and utilize engine braking, which reduces brake usage and enhances safety. For overtaking, I use M+ to upshift for quicker acceleration. Beginners shouldn't be intimidated by its complexity; start practicing on gentle slopes in the city, and you'll get the hang of it quickly. This feature offers much more flexibility than sticking to the fixed D mode.

[MacNevaeh]

M+ and M- on automatic transmission vehicles refer to the manual mode control buttons: M+ for upshifting to increase speed, M- for downshifting to enhance torque. Initially, I didn't understand this design, but after frequent mountain driving, I realized it protects the transmission, such as reducing risks on long descents without relying on brakes. Compared to snow mode or regular D gear, M mode gives a greater sense of control. On highways or in city traffic jams, using M-/M+ prevents unexpected gear shifts, helping to save fuel and improve response speed. I recommend practicing on smooth roads regularly to build muscle memory for true safety and effectiveness. Avoid misoperations like sudden braking combined with manual shifting; mastering it takes just a few simple steps.