I have the same issue with my truck and have been fighting it all winter. I'm drinkin buds with my diesel tech and service manager so usually they treat me right. They told me that the system is progrmmed at the factory based on the stock tires (whatever it is on the sticker inside the door panel) and cannot be changed or disabled. :-(
There has to be some way to re-program it to accept a lower pressure, though. If someone figures this one out, please let me know.
Basically, this system is a total PIA!!