Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (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 four consecutive drive cycles.