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How can I gauge if I need to replace the entire unit or just the gears?
I have a 2011 M3 with 40k. Drives perfect but every once in a while when I go WOT, the car goes into limp mode. This happens about once week over the past month or so. Not getting any better, not getting any worse. If I drive normally, there is never an issue.
When the issue occurs, the car goes into limp mode and shows: Service engine soon, the half engine sign, BRAKE, and DSC light. The OBC shows DSC malfunction.
My code scanner shows: U118 and P154E (Throttle-valve monitoring, bank 1)
Once I restart the car, it goes back to normal.
I have read a few threads about this issue and it seems like some people go into limp mode much more frequently. Is it safe to assume that my gears are on their way out? Would I likely be ok just replacing the gears or buying an entirely new unit?
Is it safe to assume the circuit board is ok since I don't have codes: 2B15 (Throttle valve actuator), 2B57 - (Limp mode active), 5E19 (DSC-DME communication)
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