I got the DRIVE SYSTEM WARNING too after downloading 2.6.16 Remote diagnosis with help of Marqie found a COOLANT VALVE FAULT. Resets didn’t help. While exchanging texts with my service center 2 days after getting the warning and before ordering a tow to my service center, I went back to my car to make sure the warning was still there. Well, it wasn’t. Drove the car around town for a while and never got the warning. Car drove normally. The service center and I agreed to monitor the situation. We’ll see what happens today. Seems like it might be a software thing.