4B39 - P0403 (DDE)

4B39 - P0403

Information saved in
DDE

Fault code
4B39 - P0403

Fault text
DDE: Exhaust-gas recirculation controller, activation: Open
circuit

Fault description
The DDE recognizes an open circuit in the output stage:
EGR actuator.

Condition for fault identification
Test condition:
The error is evaluated when a sticking valve is recognized or
the open circuit diagnosis is active.
The diagnosis routine also runs when a start occurs.
Voltage condition:
The error is evaluated when a sticking valve is recognized or
the open circuit diagnosis is active.
The diagnosis routine also runs when a start occurs.

Condition for fault memory entry
Debounce (220 ms)

Action in service
1. Check wires and plug connections.
(open circuit)
2. If wiring and plug connections are OK:
Replace EGR actuator.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL_SVS

Service instruction
With some engine versions the appropriate service function
must be used to reset the EGR valve's adaptation before the
EGR valve is replaced.