When Monitored
WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic runs once within five minutes after engine startup provided a block heater is not detected and provided there is a minimum 10 degree C (18 degree F) coolant temperature drop between previous ignition off and next key on; and power-down coolant temperature is greater than or equal to 76.6 degrees C (169.8 F).