Theory Of Operation
WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 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 the ignition off time received from Body Control Module (BCM) is either too high or too low compared to a calculated value. The PCM also factors in the coolant temperature drop observed over a key cycle during this monitor.