Mercedes Benz Truck R 320 BLUETEC Technical LI49-20_P-053152 Date: 120808 Exhaust System - DTC 20B811 Stored In AdBlue(R) Control Unit Fault code 20B811 (The output for the heating element of the AdBlue delivery module has a short circuit to positive) is stored in the AdBlue

Mercedes Benz Truck R 320 BLUETEC Technical LI49-20_P-053152 Date: 120808
Exhaust System - DTC 20B811 Stored In AdBlue(R) Control Unit
Fault code 20B811 (The output for the heating element of the AdBlue delivery module has a short circuit to positive) is stored in the AdBlue
control unit
Themen-Nummer LI49.20-P-053152
Mercedes Benz Truck R 320 BLUETEC
Page 42
Version 1
Konstruktionsgruppe 49.20 Exhaust aftertreatment unit
Stand 08-08-2012
Gultigkeit
08-08-2012
Anderungsgrund
Beanstandung:
Engine diagnosis warning lamp lights up
Fault code 20B811 (The output for the heating element of the Ad Blue delivery module has a short circuit to positive) is stored in the AdBlue control
unit
Ursache:
Due to excessively sensitive diagnostic routines a fault entry for the heating element of the Ad Blue delivery module may be logged during the
warm-up phase at low outside temperatures.
Abhilfe:
Program BlueTec control unit (SCR) with new software
Note
The software is available with the following add-ons:
^ DVD 01/2012 - add-on 2274
^ DVD 03/2012 - add-on 2275
^ DVD 05/2012 add on 2306
If the fault code is still current even after programming the BlueTec control unit, process the test steps in XENTRY/Star Diagnosis for this fault
code.
Symptome
Mercedes Benz Truck R 320 BLUETEC
Page 43
Steuergerat/Fehlercode