Why does the Volkswagen DSG transmission make abnormal noises?
4 Answers
Most abnormal noises in Volkswagen DSG transmissions are caused by the clutch plates during the separation and engagement process. Some transmission noises are due to issues with the valve body. The dual-clutch transmission is currently a popular type of transmission, with an internal structure similar to that of a manual transmission, except it has two sets of clutches. Volkswagen DSG refers to the brand's direct-shift gearbox, also known as the S-Tronic transmission or double-clutch gearbox. Its unique feature is that it shifts gears faster than other transmissions, delivers greater torque, and operates more efficiently.
I've driven Volkswagen cars for over a decade, and DSG abnormal noises are indeed common. That clicking sound at low speeds is mostly caused by clutch plates, especially prone to occur in congested areas with frequent gear shifts. I've seen many fellow drivers encounter this situation, mainly due to uneven wear from prolonged semi-engagement of the dual clutch. Additionally, deteriorated transmission fluid can exacerbate friction noise, so it's recommended to change it around 60,000 kilometers. Truth be told, dry-type DSG has always had some shortcomings in heat dissipation, which becomes particularly noticeable after aggressive driving. Don't ignore such abnormal sounds, as they may develop into gear shift jerks or even power interruptions.
In the repair shop, we often receive owners complaining about DSG transmission noises. I usually start by using a diagnostic tool to read the transmission fault codes. About 80% of the issues stem from the clutch module, especially the typical clicking sound during low-speed gear shifts between 1st and 3rd gears. Unstable hydraulic control in the mechatronic unit can also cause metallic knocking sounds from the shift forks. I remember a Golf 7 that had particularly severe noises on bumpy roads, and upon disassembly, we found the transmission mount bushings had aged. I recommend checking the transmission mounting bolts during every maintenance service, as looseness can amplify mechanical noises. It's best not to delay such faults, as minor issues can escalate into major repairs.
DSG transmission noise issues should be examined from the design perspective. Volkswagen's dual-clutch structure inherently has weaknesses in low-speed ranges, where gear shifting inevitably produces impact noises. This is particularly noticeable in vehicles over seven years old as clutch plate clearances increase. Wear in the mechatronic control unit can cause unstable oil pressure, amplifying noise during gear changes. During a recent test drive, pronounced rattling during rapid acceleration was identified as a bearing clearance issue. While not affecting short-distance driving, prolonged neglect may damage synchronizers. Regular transmission adaptation learning can mitigate this problem.
