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Today I had also noticed a warning message on the ISS truck saying "Exhaust overloaded, drive to clean." I goggle goggled what this meant and what to do. This means the DPF (diesel particle filter) is blocked and needs cleaning by driving. It was suggested in the blogs I read to drive at speeds above 55mph for about 30 minutes for the filter to be cleaned. I took the truck for a drive and had gotten a "cleaning filter message" which meant the truck was doing its thing to clean the filter. After taking it down the highway the messages all cleared. Since we are doing a lot in town driving and short trips in cold weather this will likely happen again, as all of these factors cause the dpf to clog up.