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What is the function of shifting to P gear in an automatic transmission?

2 Answers

LaMary

07/24/25 10:19am

The function of shifting to P gear in an automatic transmission is: When the automatic transmission is shifted to P gear, the transmission locks the parking gear part, and at this time, the vehicle has a certain parking effect on flat ground without stepping on the brake. Precautions for shifting gears in an automatic transmission car: 1. Do not step on the accelerator pedal when shifting gears; 2. Do not immediately step on the accelerator pedal hard after shifting into gear; 3. The vehicle can only be started in P or N gear; 4. The gear lever must be stepped on the brake to remove it from P gear; 5. Do not shift into N gear to coast while driving; 6. Do not push into P gear while the vehicle is moving; 7. When changing the direction of travel, switching between D gear and R gear must be done after the vehicle has come to a complete stop; 8. If the gear is placed in N while driving, the oil pump cannot supply oil normally for lubrication, which can cause the temperature of the internal parts of the transmission to rise and cause damage.

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BraxtonLee

08/11/25 5:27am

I've been driving for over a decade now, and I use the automatic transmission's P (Park) gear every day, mainly for locking the car. Whenever I park, engaging the P gear locks the transmission's output shaft, preventing the wheels from moving freely and keeping the car stable without any risk of rolling or unexpected movement. This works in tandem with the brakes and is particularly important—for instance, when parking on level ground, I always press the brake firmly before shifting to P gear to eliminate any chance of the car rolling. I still remember one time on a slope when I almost had an accident because I forgot to engage P gear—luckily, I snapped out of it in time. Beyond safety, P gear also ensures a smoother engine start. Many cars won't even allow you to press the ignition button unless you're in P gear. Over the years, I've developed a good habit: always shifting to P gear when parking and pulling up the handbrake as an extra precaution. This helps protect the transmission components from wear and tear, especially in city driving where you shouldn't randomly shift to N (Neutral) at red lights. In short, P gear is simple but crucial—new drivers should learn to use it early to avoid costly repairs down the road.

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