49E5

49E5 - P20B6

Information saved in
DDE

Fault code
49E5 - P20B6

Fault text
DDE: Reducing-agent pressure-line heating: Open circuit,
heater circuit

Fault description
Monitoring reduction agent metering line heater. An open
circuit error is recognized when the heating system's
monitored current draw is below the limit value
UHC_iPLSensOnMin_C by an increment defined according
to operating point.

Condition for fault identification
Test condition:
The test routine runs when the following conditions are
satisfied:
- The active tank heating system is activated.
- No battery fault is detected.
Voltage condition:
The test routine runs when the following conditions are
satisfied:
- The active tank heating system is activated.
- No battery fault is detected.

Condition for fault memory entry
Debounce (2200 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Use diagnostic system to activate the heater.
4. Replace metering line.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Measure resistance in the metering line
Can only occur with earlier power switch installed prior to
09/2009.