Why does the car shake after shifting to P gear when parking?
2 Answers
Specific introduction to the shaking after shifting to P gear when parking is as follows: According to the structural design of automatic transmission, the P gear is designed as the parking gear: The principle involves a brake pawl that engages with the ring gear. As long as the ring gear is engaged, it remains in constant motion. The locking mechanism of the P gear is due to the interaction between the gear on the transmission's output shaft and the locking pin, which is why the car cannot move forward or backward after shifting to P gear. The steeper the slope, the greater the force required. For this situation, it is better to first stop the car completely, apply the handbrake, and then shift to P gear for better results. Issue with the lock-up clutch: There is a lock-up clutch inside the transmission. When shifting to P gear, if the clutch lock pin is not engaged properly, the car may shake slightly as the lock-up clutch engages.
I've been driving for many years and often encounter the situation where the car shakes slightly after shifting into P gear. Most of the time, this is normal because when the P gear locks the transmission, the small pawl needs to engage with the gear, causing a slight vibration. Especially when parked on a slope, the weight of the car shifts slightly, leading to a minor shake. I remember the first time I noticed this, I thought the car was broken. Later, a mechanic explained that this is a characteristic of automatic transmission design. It's recommended to first firmly engage the handbrake to stabilize the car body before shifting into P gear, as this can reduce the shaking. If the shaking is severe every time or accompanied by strange noises, there might be wear in the transmission or the brakes aren't fully released, and it's best to have it checked at a 4S shop. Developing good habits can protect your car and save you a lot of trouble.
