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Why Is There Abnormal Noise Outside the Car When Shifting an Automatic Transmission?

1 Answers

MadisonLee

07/30/25 6:03am

The causes of abnormal noise outside the car when shifting an automatic transmission include issues with the generator gear, shifting without the car coming to a complete stop, or problems with the transmission. Below are the detailed explanations: 1. Problem with the generator gear: The symptom is a clicking sound when shifting to D or R gear while pressing the brake, but no sound when shifting to N gear. 2. Shifting without the car coming to a complete stop: This operation not only causes abnormal noise but also significantly shortens the transmission's lifespan. 3. Problems with the transmission: Such as a loose drive shaft, worn differential, worn output shaft inside the transmission, worn transmission gears, or malfunctioning shift mechanism, etc.

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