SES-coolant temp below optimal thermostat regulating temp

[tsgibbs]

Has anyone gotten this SES error...."coolant temp below optimal thermostat regulating temp" or something of the sort? I have a 2001 X5 (3.0), and I have been getting this error for about a month now. I have cleared the message assuming as long as the vehicle was not running hot, it must be an error. It stays clear for about a couple of days, then it comes back on. Until recently, my temperature gauge would read at approximately 11 o'clock. Now it reads at 12 o' clock, but the error keeps coming up. I also assumed the temperature gauge change to be a function of the ambient temp as well (i.e. driving in colder weather vs. hotter weather). What could be causing this, and how do I remedy this? Any and all help will be most appreciated.

Thanks!