P2459

4C63 - P2459

Information saved in
DDE

Fault code
4C63 - P2459

Fault text
DDE: Particulate filter system: excessively frequent engine-
protection regenerations

Fault description
The diagnostic trouble code is logged when the DDE
recognizes that particulate filter regeneration to protect the
engine has been activated too often.

Condition for fault identification
Test condition:
When the engine is running the error check runs in a 100 ms
grid on a continuous basis.
Voltage condition:
When the engine is running the error check runs in a 100 ms
grid on a continuous basis.

Condition for fault memory entry
Debounce (100 ms)

Action in service
1. Check oil level and oil change intervals.
2. Conduct exhaust-gas backpressure test to allow
assessment of particulate filter condition.
3. Test of swirl valves/throttle valve using activation and
visual inspection.
4. Check mass-airflow sensor (the error can occur if the
HFM is measuring too much air).
5. Perform mass airflow system test (on engines with single-
stage boost).
6. If swirl valves, throttle valve and mass-airflow sensor are
OK:
Request/conduct service regeneration if customer engages in
short-distance driving.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none