Theory Of Operation
WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) determines that there is a leak in the Low Pressure Fuel Delivery system based on inputs from the High Pressure Fuel system, Fuel Tank Level Signal, Emissions systems, and other engine conditions. The PCM will turn on the MIL lamp immediately after this diagnostic runs and fails. This DTC will cause active regeneration to be disabled. The PCM will turn off the MIL lamp after the diagnostic runs and passes in 4 consecutive drive cycles.