Mercedes Benz Truck R 320 BLUETEC Technical T-47_10-55 Date: 090416 Cooling System - MIL ON/DTC 205C21 Set
Mercedes Benz Truck R 320 BLUETEC Technical T-47_10-55 Date: 090416 Cooling System - MIL ON/DTC 205C21 Set Date: April 16, 2009 Order No.: T-B-47.10/55 Supersedes: Group: 47 SUBJECT: Model 164.125/825 Model 251.125 Check Engine Light Illuminated with DTC 205C21 If you receive customer reports in the above model vehicles of the check engine light being illuminated with Diagnostic Trouble Code 205C21 (Temperature sensor the "AdBlue tank" has a short circuit to ground. The signal amplitude is less than the minimum amplitude) stored in the AdBlue control unit (SCR), this may be due to a temperature difference between the intake air, coolant, exhaust and AdBlue temperatures of greater than 25° C (77°F) after the engine is started. This fault code may be set when the AdBlue tank is frozen (after the vehicle is parked for an extended period at cold temperatures) and the vehicle is then driven into a warm location (workshop, garage) where the engine is started at leas...