My 2014 CTD has a slow tire air leak. I have not been able to find the cause so far. My problem is that the low pressure warning never displays when I am driving in town and have easy access to my air compressor. It only displays when I am on the road for my frequent long work trips. Then I have to stop at a rest area and deal with the inconvenient onboard compressor. I'm not sure if this is a malfunction or the warning is stupidly designed. The warning is not really useful if it only works after driving the CTD for 45 minutes. Anyone having similar problems?