46CE

46CE - P20BF

Information saved in
DDE

Fault code
46CE - P20BF

Fault text
DDE: Reducing-agent pressure-line heating, activation:
Short circuit to ground

Fault description
The DDE recognizes short circuit to ground error in the
output stage:
Reduction agent pressure line heating

Condition for fault identification
Test condition:
The check frequency depends on the process sequence
control.
Voltage condition:
The check frequency depends on the process sequence
control.

Condition for fault memory entry
Debounce (1000 ms)

Action in service
1. Check wires and plug connections.
2. Defective power switch.
3. Defective fuse.
4. Defective relay.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Heater circuit 2 is for the metering wire and delivery
module.
If DTC 4C72 or 49ED is logged, this is a collateral error and
shuts down the relay. Repair this malfunction and delete
stored DTCs from the error memory.