The tire pressure sensors in the C14 are powered by a small lithium ion coin type battery. Lithium batteries are subject to a problem that causes the initial voltage on them to be low, due to a passivation layer that builds up on the anode of the battery when they are at rest. As current is drawn from the battery, this passivation layer breaks down, and the voltage begins to rise back to normal. In colder temps, the passivation layer breaks down at a slower rate, thus causing low battery warning messages. If the message goes away after a couple minutes of riding, this is most likely what is occurring, but if it stays on, then you could have a bad battery in your tire pressure sensor. FYI, I have taken a sensor apart, and it would be possible to replace the battery in one, though they aren't really designed to have that done. You have to split open the case, and then buy a coin battery with tabs spot welded on it, and you would have to solder it onto the circuit board. Since the tire pressure sensors are covered under the 3 year warranty, if you have a bad battery in one, I would suggest getting your dealer to replace it. He will also have to program it into the KIPASS ECU with the Kawasaki KDS3 diagnostic tool. When bikes start going out of warranty, owners might want to start trying to change out batteries on their own, since the sensors are about $135 each, and then you would have to also pay the dealer labor to reprogram the KIPASS for the new sensor. As for the low pressure warning, it is designed to come on when the tires reach 32 psi (or 220 KPA). This is normal operation The photos below show a sensor opened up, and are provided for your entertainment only. http://www.pbase.com/fredharmon/tiresensor