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What are the reasons for the frequent transmission system failures in the BMW iX3?

2 Answers

VanAdriel

07/24/25 6:41am

The causes of transmission system failures in the BMW iX3 include abnormal speed in the hydraulic transmission system, abnormal operation in the hydraulic transmission system, and abnormal pressure in the hydraulic transmission system. When abnormalities such as overheating, oil leakage, noise, or vibration occur in the hydraulic transmission system, do not rush to shut down the equipment. Instead, follow the principle of 'one touch, two looks, three observations' to accurately determine the location of the operational abnormality and conduct a systematic analysis of the fault causes and troubleshooting. Abnormal speed in the hydraulic transmission system: If a fault occurs due to abnormal speed, it is necessary to adjust the variable structures such as the throttle valve, relief valve, variable pump, and speed control valve one by one, then compare the speed range values with the technical reference values for analysis. Abnormal operation in the hydraulic transmission system: If a fault occurs due to abnormal operation, observe the operational state of the relevant system's actuators to determine whether they are functioning normally. Identify the directional control valve with abnormal operation, then inspect the travel control to locate the abnormal part in the hydraulic transmission system. Abnormal pressure in the hydraulic transmission system: To determine if a fault is caused by abnormal pressure, use a pressure gauge to measure the pressure values at the reserved pressure measurement points on the system pipeline. Analyze the difference between the measured values and the standard values to identify the fault location causing the abnormal pressure in the hydraulic transmission system.

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LaLiam

08/11/25 2:27am

As a long-term owner of the ix3, I've noticed in daily use that frequent drivetrain malfunctions likely stem from insufficient cooling of the electric motor. Especially during high-speed driving or uphill climbs, the motor tends to overheat and trigger the protection mechanism to shut down automatically, causing sudden loss of power. Software bugs in the control unit are another common issue—BMW occasionally releases updates, but delayed installations can lead to problems. The instability of the battery management system can also disrupt power output, causing drivetrain interruptions. This poses safety hazards, such as the danger of sudden power loss at high speeds. I believe adhering to regular maintenance is crucial. Having professionals inspect the cooling system and software versions each time can effectively reduce malfunctions.

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