What Causes the Abnormal Noise During Gear Shifting in Dual-Clutch 1-2-3 Upshifts and Downshifts?
3 Answers
Abnormal noise may originate from the clutch or shift fork, and it is recommended to have it inspected at a 4S shop. Below is relevant information about dual-clutch transmissions: 1. Introduction: A dual-clutch transmission (DCT) differs from conventional automatic transmission systems. It combines the characteristics of both manual and automatic transmissions, offering the flexibility of a manual transmission and the comfort of an automatic transmission while providing uninterrupted power output. 2. Working Principle: The dual-clutch automatic transmission (DCT) is based on a manual transmission. Unlike a manual transmission, the two clutches in a DCT are connected to two input shafts, and gear shifting and clutch operations are controlled by an integrated mechatronic module consisting of electronic and hydraulic components, eliminating the need for a clutch pedal. Similar to a tiptronic hydraulic automatic transmission, the driver can manually shift gears or place the gear lever in fully automatic D mode (comfort-oriented, shifting at low engine speeds) or S mode (performance-oriented, shifting at high engine speeds). In this mode, gear shifts are typically executed by gear and clutch actuators. Each clutch is connected to a different input shaft. For example, if clutch 1 is connected to gears 1, 3, and 5 via a solid shaft, then clutch 2 is connected to gears 2, 4, 6, and reverse via a hollow shaft.
I've been driving a dual-clutch transmission (DCT) car for several years. When encountering abnormal noises during gear shifts (both upshifts and downshifts), the most common causes are clutch disc wear or slippage, especially during frequent low-gear changes like 1-2-3 shifts. If you hear clicking or squeaking sounds during gear changes, it's likely due to excessive wear of the friction plates in the dual clutch, resulting in mismatched clearances that cause mechanical friction noises. Additionally, aged or insufficient transmission fluid leads to inadequate lubrication, accelerating wear and making noises more pronounced. I recommend regularly checking the transmission fluid level and quality - replace it promptly if it appears darkened or depleted. Also, avoid aggressive throttle inputs during stop-and-go traffic that forces frequent gear changes, as this extends clutch life. If noises persist, visit a workshop to scan for potential sensor faults using diagnostic equipment - don't delay as repair costs escalate over time. Safety-wise, these noises may indicate uneven transmission load distribution, so maintain smooth speed control during gear transitions while driving.
Just after hitting the road with my new car, I noticed abnormal noises in the dual-clutch transmission during 1st to 3rd gear shifts. This is usually caused by imprecise ECU software control, where delayed computer commands during low-speed gear changes lead to rough clutch engagement. For example, during downshifts, sudden engine RPM changes can cause friction noises if the computer isn't properly calibrated. Temperature also plays a role - cold winter starts tend to exacerbate the issue. I've tried resetting the transmission logic through vehicle settings or updating the infotainment system software to mitigate this. Remember to check the user manual or ask the dealership about available software updates before considering mechanical repairs. During normal driving, maintaining steady acceleration and avoiding sudden stops/starts can reduce occurrences. Adding cleaning additives during regular maintenance also helps significantly by removing deposits.
