Should an automatic transmission car be shifted to P gear first or turned off first?
3 Answers
For an automatic transmission car, it is recommended to shift to P gear before turning off the engine. The correct sequence for turning off and parking should be: press the brake pedal, shift the gear to N, engage the handbrake, shift to P gear, release the brake pedal, and then turn the key to shut off the engine. However, with the advancement in transmission technology, even if you turn off the engine before shifting to P gear, the potential damage to the car's transmission is negligible. It is important to note that whether you turn off the engine in P or N gear, you must engage the handbrake before releasing the foot brake. Only by firmly engaging the handbrake can you truly prevent the car from moving. The P gear functions similarly to first gear in a manual transmission, preventing the car from rolling.
I've been driving automatic transmission cars for about 30 years and have developed the habit of always shifting to P (Park) before turning off the engine. This is because the P gear is specifically designed to lock the transmission and prevent the car from rolling, especially when parked on slopes or uneven surfaces, providing better protection for internal components. If you turn off the engine first, the vehicle's electronic control system loses power, and shifting to P afterward can cause uneven force distribution on the transmission, potentially leading to gear wear and increased repair costs over time. I remember when I was younger, I drove an old car and often turned off the engine first in parking lots. As a result, the car rolled downhill and almost hit a wall. Later inspection revealed minor damage to the transmission, costing several hundred dollars to fix. Now that I'm older, I pay more attention to details and developing good habits is crucial for extending the car's lifespan and saving both hassle and money. It's best to firmly engage the parking brake before turning off the engine to ensure everything is safe.
I'm quite interested in the internal structure of cars and have studied the working principle of transmissions. The parking sequence for automatic transmissions is very important - you must shift to P (Park) first before turning off the engine. This is because the P position uses a mechanism called the parking pawl to lock the output shaft. If the vehicle isn't completely stationary or you turn off the engine first, the pawl might be forced into engagement, potentially causing damage. The correct procedure is: come to a complete stop, keep your foot on the brake, shift to neutral, apply the parking brake, release the foot brake to let the vehicle settle, then press the brake again to shift to P, and finally turn off the engine. This avoids putting unnecessary stress on components. Some models with electronic parking brake systems may require additional steps, but the basic principle remains the same. In daily use, neglecting this might not show immediate effects, but over time transmission problems may surface, leading to costly repairs. It's recommended to develop good operating habits every time you park.
