What Causes Abnormal Noises When Shifting an Automatic Transmission?
2 Answers
Abnormal noises when shifting an automatic transmission are caused by improper human operation or issues with the transmission structure. Specific causes of abnormal noises: Human factors include shifting without coming to a complete stop or incorrect operation sequence when parking on a slope; structural factors of the transmission include malfunctioning shift mechanisms or worn transmission gears. Other causes of abnormal noises: After shifting an automatic transmission, the engine's power is directly transmitted to the transmission. During cold starts, the transmission gears may not be fully lubricated, which can also cause noise. Therefore, it is best to let the car warm up before shifting and driving after a cold start. This practice protects both the transmission and the engine.
When shifting gears in an automatic transmission, there is abnormal noise. I used to encounter this situation often, mostly because there was a problem with the transmission fluid. Insufficient fluid level or old, deteriorated fluid leads to inadequate lubrication, resulting in a grinding or clicking sound when shifting gears. Sometimes it's due to internal component wear, such as aging gears or bearings after several years of use, increasing friction. There's also the issue of a loose gear shift lever, where pushing it causes wobbling and noise. These minor problems are easily overlooked, but ignoring them can affect driving safety and even lead to a breakdown on the road. I recommend first checking the fluid level—open the hood and inspect the dipstick. If it's too low, add some fluid; if the fluid is too dark, replace it with new fluid. For more complex issues, it's safer to leave it to a professional mechanic rather than attempting a DIY fix. When driving, pay attention to smooth gear shifts to reduce wear and extend the transmission's lifespan.
