Guys, I believe my car (05 E90 325i) might be running into the same issue.
I spot the 2E81 code.... cleared it and it showed up again after a trip.
Seems my pump is going. Weird enough though, the RPM did drop to 0 according to the record but I did not get any overheating warning (YELLOW or RED).
So I'm not sure if it is a sensor issue or the pump issue itself.
Having said that, according to OBD2 reading the coolant temperature is maintaining around 100-105 degC (not F) under daily drive. Is it normal?
Last edited by evssss1; 10-12-2012 at 08:09 AM.