2004 Cadillac Tire monitor reading incorrect pressure causing the light to come on,if I drive the car and get the tires heated the pressure will climb enough to put the light out,but never reaches the actual tire pressure. Can this monitor be reset or just needs to be replaced

 

It is most likely the sensor in tire. If you change tire position on car does low tire pressure follow tire? If so replace sensor. Are all tires same brand and size have equal tread? there is a procedure to reset tire monitor in owner's manual