4952 - P20E9 (DDE)

4952 - P20E9

Information saved in
DDE

Fault code
4952 - P20E9

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

Fault description
Monitoring reduction agent metering. If the specified
pressure for the delivery module rises above the maximum
pressure threshold 6500 mbar for at least 1 s the diagnostic
trouble code is logged.

Condition for fault identification
Test condition:
The error check runs only when the metering function is
active.
Voltage condition:
The error check runs only when the metering function is
active.

Condition for fault memory entry
Debounce (0 ms)

Action in service
1. Use diagnostic system to check pressurization level.
2. Check plausibility of temperature and pressure levels
within the active tank, if implausible values are present:
Check ground wires for short circuits to B+. Replace wires
and plug connections.
3. Replace delivery module.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none