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Why Can't BMW Achieve Full Power Transmission?

2 Answers

Troy

07/28/25 11:43pm

1. What is the Transmission System: The transmission system generally consists of components such as the clutch, gearbox, universal transmission device, main reducer, differential, and half-shaft. Its basic function is to transmit the power generated by the engine to the driving wheels of the car, producing driving force to enable the car to travel at a certain speed. 2. Understanding "Transmission System Fault": According to the above explanation, a transmission system fault should refer to failures in components like the clutch, gearbox, universal transmission device, main reducer, differential, and half-shaft. However, in reality, apart from these component failures being classified as transmission system faults, many unrelated issues—such as fuel pump, fuel injector, solenoid valve, sensor malfunctions, or even a damaged screw—can trigger a "transmission system fault" warning. 3. Summary of Reasons Why BMW Displays "Transmission System Fault": 1. The onboard computer cannot respond in time, causing the program to malfunction; 2. Fuel pump damage or fuel pump sensor failure; 3. Fuel injector damage; 4. Ignition coil failure; 5. Spark plug damage or carbon buildup; 6. Turbocharger wastegate damage, which may not be the wastegate itself but a clogged internal filter; 7. Incorrect vacuum tube connection on the turbocharger wastegate; 8. Relay burnout in the fuse box on the right side of the rear trunk; 9. VANOS solenoid valve damage; 10. Loose or damaged camshaft position sensor screw.

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AveryRose

08/12/25 4:02am

BMW's power delivery can sometimes be inconsistent, with common issues stemming from the turbocharger and drivetrain. Having driven several BMW models, I've noticed significant turbo lag during acceleration—the supercharger isn't fully engaged at low RPMs, causing the power to feel stuck with delayed response. Additionally, the rear-wheel-drive layout tends to lose traction on slippery surfaces, resulting in partial power loss. The ECU tuning leans toward sportiness, prioritizing handling at the expense of smoothness, which leads to discontinuous power output. Some models suffer from slow automatic transmission shifts, exacerbating the problem. Regular maintenance like oil changes and driveshaft lubrication checks can help mitigate these issues, but they're inherent to the design and can't be fully resolved.

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