Which gear should be used when driving an automatic transmission car downhill?

[McWyatt]

When driving an automatic transmission car downhill, you can choose a gear that restricts upshifting. Available gear options: You can select D (Drive) gear or L (Low) gear, which helps utilize engine braking. For automatic cars with manual mode (Tiptronic), you can downshift using the manual mode. Additionally, many SUV models are equipped with HDC (Hill Descent Control), which can be activated on steep slopes to achieve automatic deceleration without pressing the brake pedal. The vehicle will descend at a very slow speed, allowing the driver to focus solely on steering. Gears to avoid: Do not select N (Neutral) gear for coasting, as this is a dangerous practice. It eliminates the effect of engine braking, and the bad habit of coasting in neutral can damage the transmission's lifespan.

[MaverickAnn]

When driving an automatic transmission car down a steep mountain road, I switch to L gear or the manual mode's low gear, such as 2nd or 1st gear. This utilizes engine braking to slow down, which is safer and more reliable than relying solely on the brakes. If you only use the brakes during prolonged downhill driving, the brake pads may overheat and fail, potentially leading to a serious accident. I remember once forgetting to shift gears while going downhill, and the brakes were shaking violently—it was almost a disaster. Now, I prepare in advance before descending: I shift to a lower gear on flat ground, maintain a speed of 30-40 km/h, and significantly reduce brake pressure. Engine braking also helps protect the transmission and extend its lifespan, especially for frequent driving. Safety comes first, and this habit is worth cultivating. Different car models have different settings, so consulting the manual provides extra peace of mind.

[DanielFitz]

When driving an automatic transmission downhill, I prefer to shift into L gear or manually downshift, as the engine helps with deceleration, making it more worry-free. I didn't pay attention before and kept stepping on the brakes, which not only wore out the car but also tired me out. After switching to a lower gear, downhill driving becomes more stable, and I don't have to constantly monitor the speed. Especially on steep slopes like mountain road curves, shifting gears in advance reduces brake burden and minimizes noise. Beginners should try this method—it's simple and practical. Some cars don’t have an L gear, but using S gear or paddle shifters also works. The principle is to let the gears limit the speed, protecting the braking system from wear. It adds an extra layer of safety downhill and boosts driving confidence.

[GrahamFitz]

It's common knowledge to shift into a lower gear when driving an automatic transmission downhill, as it reduces reliance on braking and avoids overheating issues. Engine braking slows the vehicle through lower gear ratios, protecting brake pads and fluids. I recommend using L mode or manual mode to engage 2nd gear when descending, maintaining speed within a safe range. This is especially crucial on steep, long descents where brake failure risks are higher. It's a simple yet effective practice that extends component lifespan.

[DelTalia]

I drive an automatic transmission car with my family downhill, always shifting to lower gears like L or 2nd to ensure safety. The mountain road is steep with many turns, and engine braking helps control speed, avoiding sudden braking that might scare the kids. Overheated brakes can easily fail, posing high risks, so this driving method is smoother and more reassuring. Slowing down in advance and shifting gears reduces accidents. Safe driving is the top priority.