463E - P20E9 (DDE)

463E - P20E9

Information saved in
DDE

Fault code
463E - P20E9

Fault text
DDE: Pressure control SCR, overpressure fault: Reducing-
agent mean pressure too high

Fault description
Monitoring reduction agent metering. If the reduction agent
metering pressure rises above the limit value 7950 mbar the
error is recognized once the pre-debounce time 1 s expires.

Condition for fault identification
Test condition:
Monitoring is executed during initialization of the DDE;
before pressurization in metering module.
Voltage condition:
Monitoring is executed during initialization of the DDE;
before pressurization in metering module.

Condition for fault memory entry
Event debounced (3)

Action in service
If ice has formed, thaw system:
- Allow the engine to idle while the vehicle remains parked,
the heater units will be activated automatically. Determine
whether the fault is still present once the system has thawed.
If no ice is present:
- Replace delivery module.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none