B20C14 Mercedes Fault Code :
Read the description of B20C14 in ACM02T and the engine lights up for ACM02T - Exhaust aftertreatment (17A03) code, there are some possible causes for it.
The temperature value of component '17B10 (Exhaust temperature sensor downstream of diesel oxidation catalytic converter)' is too high or the temperature value of component '17B09 (Exhaust temperature sensor upstream of diesel oxidation catalytic converter)' is too low.