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Originally Posted by The5rivers
2021 M5C, 13.7K miles. I had the "engine coolant level low" error message pop up after a cold start tonight for about 4 seconds that went away on its own. Temp outside was 34 degrees. I drove away and the error message didn't come back. Stopped and started a few more times while running errands and still nothing.
I'm going to check out the fluid level tomorrow and see if it's actually low but made an appointment with my dealer on Monday to check for a leak and going to show them the TSB and probably just push to get it replaced under warranty.
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Same thing happened to me, stopped by the dealer as it was 5 min from my intended destination. Dealer topped off, said it didnt take much at all and "is not uncommon to need a little bit here and there". My tank doesnt appear to be failing ( no residue around it, or signs of leaking below) Car is going in later in the month for some other warranty fixes so we will see if that presents itself again.