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.
This fault code is triggered when the internal Powertrain Control Module (PCM) diagnostics detect a read or write error internal to the module. The PCM illuminates the MIL light immediately when the diagnostic runs and fails. The PCM will turn off the MIL light immediately after the diagnostic runs and passes. This fault code can only be caused by an internal PCM problem and may prevent the engine from starting.