4968 - P20B6 (DDE)

4968 - P20B6

Information saved in
DDE

Fault code
4968 - P20B6

Fault text
DDE: Reducing-agent pressure-line heating: maximum heat
output too low

Fault description
Monitoring peak power in reduction agent metering line
heater. An open circuit error is recognized when the peak
heater power lies below a limit value defined based on
operating point and the peak power test has been completed.
The peak power test is terminated when one of the following
conditions is met:
- An activation signal has been transmitted to the heater for
at least 10000 ms.
- When the peak power test has been recognized as
terminated based on the shift in the heater's power.

Condition for fault identification
Test condition:
The error check runs once the peak power test has been
completed.
Voltage condition:
The error check runs once the peak power test has been
completed.

Condition for fault memory entry
Event debounced (1)

Action in service
1.a) If this error appears together with DTC 49E5: Fault in
metering wire, check resistance.
1.b) If the error appears alone check the resistance in the
delivery module heating system.
2. Defective delivery module heating system.
3. Metering line heater defective.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none