Are you getting a "DPF FULL" message after installing a RaceME tuner? On the 2007-2012 Dodge Cummins 6.7 there is a differential pressure sensor bolted to the passenger side of the transmission. This sensors remains active after delete tuning. In factory configuration this sensor has two hoses connected to it that attach to the stainless lines on the exhaust. This sensor has to remain open to the atmosphere. Do not loop the hose around to the other outlet of the sensor. This may cause a pressure differential. Its best to leave approx. 6 inches of hose so it can be routed in a way that prevents water, mud or debris from entering. Should this sensor fail it needs to be replaced.