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What is the cause of the Mercedes-Benz CLA transmission failure?

2 Answers

DeDavid

09/01/25 3:05am

Mercedes-Benz CLA transmission failure is caused by damage to the hydraulic pump inside the rear axle. Introduction to Transmission: A device that changes the speed ratio and direction of motion. It is used in automobiles, tractors, ships, machine tools, and various machines to alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. A gear-driven transmission generally consists of a housing and several gear pairs. Introduction to Hydraulic Pump: It is the power component of a hydraulic system, driven by an engine or motor, which draws oil from the hydraulic tank, forms pressurized oil, and discharges it to the actuator. Hydraulic pumps are classified by structure into gear pumps, plunger pumps, vane pumps, and screw pumps.

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MacEthan

09/13/25 6:00am

Transmission issues with the Mercedes-Benz CLA are indeed quite common. Based on my experience repairing CLA models, the main causes are concentrated in several key components. The most frequent problem is the failure of the transmission control module (TCM) - this small box governs shift timing, and when programming errors or circuit board damage occur, the entire shifting logic becomes chaotic. Next is clutch disc wear, particularly accelerated by frequent 1-2 gear shifts during city traffic congestion. Another critical point is valve body wear - when the precision valve ports get clogged with metal debris or sealing rings deteriorate, oil pressure becomes unstable. Sensor malfunctions are also problematic; for instance, if the input shaft speed sensor fails, the transmission can't even determine whether to upshift or downshift. Finally, it's worth noting this model's transmission is particularly sensitive to fluid condition - exceeding 60,000 km without fluid change or using incorrect fluid specifications may trigger failures. Regular diagnostic scans for trouble codes are strongly recommended.

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