What are the + and - symbols on the automatic transmission gear shift?
3 Answers
The plus and minus symbols on the automatic transmission gear shift represent the manual mode. In manual mode, the driver can manually upshift or downshift, similar to driving a manual transmission vehicle. Typically, only vehicles with a manual-automatic transmission (often called "Tiptronic" or "Sportronic") feature these symbols. The symbols are usually positioned around the letter "M" (for Manual), with the plus symbol above and the minus symbol below. Pushing the lever toward the minus symbol downshifts by one gear, while pushing it toward the plus symbol upshifts by one gear. The manual mode can be engaged at any time without restrictions based on time or engine speed. The transmission will automatically match the appropriate gear based on the vehicle's real-time speed. Manual mode is commonly used in situations such as ascending or descending hills, overtaking, starting on icy or snowy roads, or in heavy traffic. When switched to manual mode, the vehicle's display will indicate the current gear (e.g., D1 for first gear, D2 for second gear).
I have always been driving an automatic transmission car, and the + and - symbols on the gear shift are controls for the manual mode. Simply put, when the vehicle is switched to manual mode, pushing the + sign upshifts, meaning changing from a lower gear to a higher gear to reduce engine RPM, which is suitable for fuel-efficient highway cruising; pushing the - sign downshifts, changing from a higher gear to a lower gear to increase engine RPM, making it easier to use engine braking when climbing or descending hills. I frequently use this feature during my daily commute. For example, in traffic jams, manual downshifting allows for smoother starts and reduces jerking; when overtaking on the highway, downshifting enables faster acceleration response. Additionally, during long downhill stretches on mountain roads, I use the - gear to slow down, avoiding continuous brake use that could lead to overheating and failure. This not only extends the lifespan of vehicle components but also enhances driving safety. Once familiar, this feature gives automatic transmissions the flexibility of manual control, making it ideal for practical-minded drivers like me.
I've seen the design of this feature, the '+' and '-' on the gear shift are essentially manual shifting buttons. Pressing '+' means upshifting, for example from third gear to fourth gear, which lowers the engine RPM and reduces fuel consumption; pressing '-' is downshifting, like from fifth gear to fourth gear, increasing engine RPM for more power. I often use this mode while driving, especially in bad weather—manual downshifting on slippery roads during rain or snow provides better traction and control, preventing skidding. Upshifting on steep climbs saves effort, while downshifting on descents enhances safety. The system also protects the engine from damage by preventing excessively high or low RPMs, so it's very reassuring to use. The learning curve is low, even beginners can easily get the hang of it—just switch to M or S mode. Overall, this feature combines the convenience of an automatic transmission with the engagement of a manual one, making it both practical and safe.
