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What causes the gear shifting noise in BMW 3 Series transmission?

1 Answers

JoyAnn

07/29/25 9:44pm

BMW 3 Series transmission gear shifting noise mainly occurs due to the following reasons: Valve body internal blockage: Accumulation of dirt and impurities inside the valve body forms blockages, preventing effective regulation of oil pressure, leading to jerking, impact, and slipping issues; Transmission noise: The transmission has numerous components, and the causes of noise are relatively complex. During analysis and judgment, attention should be paid to: whether it is related to specific speeds, such as some planetary gears producing noticeable noise around 50Km/h. Whether it is related to certain gears, which is crucial for diagnosing transmission faults. If noise occurs in a specific gear, it is certainly related to components affecting that gear's transmission; if noise occurs in all gears, it is often due to faulty constant-mesh gear shafts or insufficient transmission oil.

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