Funny this thread came up!

My wife alerted me to the same thing last night, and I had sufficient coolant as well.

I inspected the connector and cleaned it a bit, and the light wasn't on when I drove to work.

I didn't do the thorough silicone cleaning necessary, so I expect to see the yellow glow soon.

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car