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When to Use D+ or - in Automatic Transmission Cars?

2 Answers

DeNathan

07/23/25 11:16pm

Below is the usage of D+/- in automatic transmission: Meaning of D+/-: The "D+" and "D-" in automatic transmission refer to the manual mode of the car. When the gear is in D, moving the gear lever to the left or right switches to manual mode. In manual mode, you can shift gears by operating "D+" and "D-". Pushing towards "D+" shifts up, while pushing towards "D-" shifts down. Usage of D+/-: When going downhill, you can use "D+" to shift to D2 or D3. Downhill driving utilizes the engine's braking effect, and 2nd or 3rd gear can meet the power demand. "D+" is also needed. When going uphill, the power demand is higher, so "D-" should be used to downshift the vehicle for climbing. Similarly, if the vehicle starts to accelerate downhill uncontrollably, use "D-" to downshift and control the speed. Additionally, "D-" can be used for short overtaking or in congested road conditions.

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LeMax

08/10/25 7:13pm

I truly understood the wonders of manual shifting only after driving an automatic transmission car on mountain roads. During long descents, shifting from D to the minus sign gear noticeably engages engine braking, eliminating the need for constant brake pedal pressure and preventing overheating. Once descending Taihang Mountain's 20+ km continuous downhill, I barely touched the brakes - the discs stayed merely warm. The plus sign gear proves equally valuable for steep climbs; last winter on snow-covered switchbacks, third gear provided exceptional traction where D would've caused wheelspin. Even urban overtaking benefits - dropping two gears before highway passes delivers throttle response so sharp it feels like a different car. At red lights, simply holding the brake suffices, freeing you from constant gear monitoring in this manual mode.

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