I have an older Bel 960 (sister unit to the 985) I sometimes get a low voltage warning, I know that the Voltage detection is disabled on the 960 and the 985 has it. I was wondering if this similar to a "Self Calbration message on the newer units" or my electrical system is low. I will check the the plug to make sure it is fully in the cigarette lighter socket, to make sure that is not causing the message. I was wondering what you thought? I can not remember if it happens when I am idling or running the car. My car does not have a volt meter to check voltage. Mem Tek what do you think?