MasterTuning Fault code dictionary (DTC)

P2459 — Diesel Particulate Filter Regeneration Frequency

Severity: Serious Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningThe engine computer has noticed that the diesel particulate filter is regenerating much more often than normal. This usually means the soot is building up too fast, or the filter is struggling to complete its self-cleaning cycles.
FamilyPowertrain (P)

Typical symptoms

Frequent activation of the cooling fans after shutdown
A burning smell near the rear of the vehicle
Slightly higher fuel consumption during short trips

Common causes

Frequent short trips that do not allow the engine to reach operating temperature
A faulty exhaust gas temperature sensor giving wrong readings
Ash accumulation inside the diesel particulate filter over high mileage
Issues with fuel injectors or the EGR valve creating excess soot

What to do

Drive the car for a sustained period on a highway at a steady speed to give the filter a chance to complete a full cleaning cycle. If the warning persists, have a technician check the soot load and sensor readings soon to avoid clogging the filter.

Frequently asked questions

What does code P2459 mean?

Diesel Particulate Filter Regeneration Frequency. The engine computer has noticed that the diesel particulate filter is regenerating much more often than normal. This usually means the soot is building up too fast, or the filter is struggling to complete its self-cleaning cycles.

Can I keep driving with code P2459 active?

With caution: limp mode possible, have it checked soon

Common causes — P2459

Frequent short trips that do not allow the engine to reach operating temperature A faulty exhaust gas temperature sensor giving wrong readings Ash accumulation inside the diesel particulate filter over high mileage Issues with fuel injectors or the EGR valve creating excess soot

How do you fix code P2459?

Drive the car for a sustained period on a highway at a steady speed to give the filter a chance to complete a full cleaning cycle. If the warning persists, have a technician check the soot load and sensor readings soon to avoid clogging the filter.

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