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Steve, BMW Expert
Category: BMW
Satisfied Customers: 25403
Experience:  BMW Expert
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I was just driving down the motorway and the dtc light

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I was just driving down the motorway and the dtc light started flashing and the engine power reduced dramatically. Why did this happen?

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this is typically what happens when the vehicle's traction control system senses a loss of traction and intervenes to help prevent loss of vehicle control.

if you were not in a situation where you could have been losing traction or experiencing wheel slip, then this would be caused by a malfuntion by one of the sensors/components in the traction control system.

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Customer: replied 1 year ago.
Thanks. I was just driving normally at 70 mph but the surface of the road was quite rough ( one of those concrete motorways). Is this a serious problem and should I switch the dtc off if it happens during normal driving conditions? The car is going to the garage to investigate an engine problem on Friday.

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if the surface was rough then it could have been the car sensing a loss of traction and intervening as designed. If the system starts cutting in constantly under all conditions, then yes I would switch it off and have the system diagnosed as soon as possible, but if this turns out to be a one time thing on a poor quality roadway then I would not turn of traction control and would ignore that it ever happened.

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Customer: replied 1 year ago.
Thanks. I will get the garage to run diagnostics on Friday.