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Keeping this in view, what is a powertrain fault?

Having a powertrain failure or powertrain fault tends to happen to older and or higher mileage vehicles and can cause your vehicle's power components to overheat. If you ignore these warnings, your vehicle may operate in a defaulted “safe mode” until the issue has been resolved/repaired.

Beside above, what does drivetrain warning mean? BMW Drivetrain Malfunction error message means that the engine control module (also known as DDE ECU ECM or DME) has detected a performance issue. The maximum torque output is limited by the ECU to prevent damage.

Similarly, what do you do when your powertrain light comes on?

This is the Throttle Control/Powertrain Light. It should only come on if there is an issue, and you should have the car inspected as soon as possible. If you notice any unusual performance from the engine or transmission, consider having the car towed rather than driving it in order to prevent potential damage.

How does a powertrain work?

The powertrain encompasses every component that converts the engine's power into movement. This includes the engine, transmission, the driveshaft, differentials, axles; basically anything from the engine through to the rotating wheels.