5BF0E3 Mercedes Fault Code :
Read the description of 5BF0E3 in ACM21T and the engine lights up for ACM21T Aftertreatment Control Module code, there are some possible causes for it.
The output of component '17M03: AdBlue supply unit motor' for the actuation of component '17R04: SCR exhaust aftertreatment AdBlue metering valve series resistor' has a short circuit to positive.