"Drivetrain error" seems to be a rather broad error classification on the i8. Some people's cars seem to snap right out of it on restart. Others (like mine, twice) become completely immobilized. Mine hasn't caused any trouble anymore over the last 17'000 km, after they did software updates and replaced a gearbox sensor. Knock on wood. But if I ever get such a message again, it's straight into the shop. Not taking any chances.
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