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 Body Control Module (BCM) detects that there is no increase in the Main Fuel Tank fuel level when there is a decrease in the Auxiliary Fuel Tank fuel level. The BCM reports this to the PCM over the CAN Bus.