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What are the effects of shifting to P gear before the automatic transmission car comes to a complete stop?

1 Answers

DelLeonardo

07/30/25 5:37am

When an automatic transmission car hasn't come to a complete stop, the output shaft of the transmission is still rotating. Directly shifting into P gear engages the parking pawl with the parking gear, forcibly locking the still-rotating output shaft, which can cause damage to the vehicle. Here's an introduction to automatic transmission gears: 1. P gear: The P gear is used when parking by moving the gear selector to the P position, which locks the transmission's parking mechanism to secure the output shaft. Combined with the handbrake, this prevents the car from moving. 2. R gear: The R gear is the reverse gear, used when backing up. Never shift into reverse before the car has completely stopped, as this will cause rapid wear to the transmission. 3. D (drive) gear: The D gear represents the drive gear for normal forward driving. With the gear selector in D position, the car automatically shifts gears while driving. During long descents, since D gear doesn't provide engine braking, you shouldn't keep it in D gear continuously, otherwise the speed will keep increasing, raising safety risks. 4. L gear: The L gear is the low gear, equivalent to 2nd gear, often used when going up or down hills. 5. S gear: The S gear stands for sport mode, available in some models. In S gear, the car can shift freely but with some delay, keeping the engine at higher RPMs longer, which increases fuel consumption but provides greater torque output, typically used for overtaking. 6. N gear: N represents neutral, used when starting the car or towing. If waiting at traffic lights for extended periods, it's best to shift to N gear and apply the handbrake. However, coasting in neutral (N gear) downhill is prohibited as it not only doesn't save fuel but can damage the transmission. 7. M gear in manual-automatic models: M stands for manual mode. When switched to M gear, you can shift gears manually as needed by pushing "+" or "-" or using paddle shifters.

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