Is It Normal for an Automatic Car to Make Abnormal Noises When Shifting to P Gear?
2 Answers
It is not normal for an automatic car to make abnormal noises when shifting to P gear. The noise could be the sound of the car unlocking, and the driving method should be adjusted promptly. Below are detailed introductions about automatic cars: 1. Overview: An automatic car generally refers to a car that uses an automatic transmission (AT) to adjust the speed. While driving, the control system of the automatic transmission automatically selects the appropriate gear based on the engine's speed and load, replacing the driver's subjective judgment of timing and gear shifting operations. In simple terms, an automatic car is a "fool-proof car." 2. Transmission Types: There are mainly two types of automatic transmissions used in cars. One is the stepped automatic transmission, and the other is the continuously variable transmission (CVT). The most commonly used in passenger cars is the mechanical continuously variable transmission.
I'm the kind of guy who often tinkers with cars in the garage. A slight noise when shifting an automatic transmission into P gear is mostly normal. This is usually because the transmission's locking mechanism is engaging, like a small hook catching onto the gear to prevent the car from rolling away—especially noticeable when parked on a slope. However, if the noise is loud, like metal clashing or a harsh grinding sound, you should pay attention, as it might indicate insufficient transmission fluid or mechanical wear. I recommend ensuring the ground is level before driving, regularly checking the transmission fluid level and filter, with an oil change cycle typically around 60,000 kilometers. For older cars, abnormal noises are more likely to occur—don’t ignore them, or you might end up spending big on transmission repairs. It’s best to consult a knowledgeable friend or visit a 4S shop to diagnose the type of noise—safety first, after all.
