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Had a similar issue in my M6. Just filled up the car for a drive to Chicago. Got the "Drivetrain Malfunction" warning just after pulling out of the gas station. Car went into a low power limp mode. Drove directly to the dealer (5 miles) instead of departing on my road trip. Pulled into the service bay still running in limp mode. (I didn't want to take the chance of trying a restart until I got to the dealer). Shut the car off and restarted it and everything appeared to be back to normal. Dealer spent an hour or so going over the car. Got the "Bad Gas" disclaimer. Problem never re-appeared (2 yrs). Didn't even drain/refill the tank.
One note I did make. The car was effectively in storage for a month or so before I pulled it out of a heated garage and into the relatively cold Wisconsin weather. Then went right to the gas station to fill up. Not sure if the storage/temps had anything to do with it (condensation, etc).
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