What Causes Abnormal Noises Outside the Vehicle When Shifting an Automatic Transmission?
2 Answers
Automatic transmission shifting noises can be caused by damaged solenoid valves, burnt friction plates, or failure to replace transmission fluid regularly. Below are detailed explanations: Damaged Solenoid Valve: A faulty solenoid valve can result in excessively low or high oil pressure, causing the clutch or brake to engage with noticeable impact or delay, thereby generating abnormal noises. The solenoid valve needs replacement. Burnt Friction Plates: Burnt friction plates not only cause abnormal noises during gear shifts but also lead to jerking and poor driving performance. The friction plates require replacement. Failure to Replace Transmission Fluid Regularly: If the automatic transmission is not maintained for an extended period, the lubricating effectiveness of the fluid significantly decreases, increasing friction between gears. This accelerates gear wear and causes abnormal noises. Regular transmission fluid changes are necessary.
I drive quite frequently and have encountered abnormal noises outside the car when the automatic transmission shifts gears. The sound resembled metal scraping, especially noticeable when starting from a stop. After some research, I learned it might be due to improper gear meshing during transmission shifts or insufficient lubrication from low fluid levels. Additionally, worn-out rubber components or loose ball joints in the suspension system can also cause creaking noises during power transitions. Later, at the repair shop, I found that a screw under the chassis had loosened, and tightening it solved the problem. I recommend getting it checked early to prevent minor issues from turning into major repairs. After all, driving safety comes first. A friend of mine ignored similar sounds and ended up with a ruined transmission, which was extremely expensive to replace.
