Set Condition
WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) will set the fault if it detects that the Aftertreatment Selective Catalytic Reduction (SCR) Catalyst is not present in the aftertreatment/exhaust system.