Code P2002 / P2463: diesel particulate filter, regeneration or replacement?

What the code means

The diesel particulate filter (DPF) traps the soot from diesel engines. When it fills up, the control unit triggers a regeneration: it raises the exhaust gas temperature to burn off the soot. A differential pressure sensor measures how clogged it is by comparing the pressure before and after the filter.

• P2463: soot is above the threshold; regenerations were not enough or could not take place.
• P2002: according to the control unit, the filter lets too many particles through or behaves abnormally (cracked filter, melted filter… or a sensor giving false readings).
• P2452 to P2455: a problem with the differential pressure sensor itself.

Is it serious?

Yes, and potentially expensive if you ignore it. A DPF that keeps filling up eventually puts the engine into limp mode, and can then clog for good. Conversely, a DPF that lets particles through (a genuine P2002) often means a filter cracked by an overly violent regeneration.

The most common causes

1. City driving / short trips: the engine never reaches regeneration temperature. Soot builds up.
2. Interrupted regenerations (you switch off the engine during a regeneration you did not notice: fan running hard, higher fuel consumption, hot smell).
3. Differential pressure sensor or its hoses (split, blocked, or swapped round after a service).
4. DPF additive (cerium/Eolys on PSA, Ford, Mazda, some Volvos) run dry, or a failed additive pump.
5. A faulty exhaust gas temperature sensor: the regeneration does not start.
6. Unsuitable oil (not “low SAPS”) or oil consumption: ash that blocks the filter permanently.
7. A clogged EGR valve that increases soot production. See P0401.

What to check first

1. Read all the codes with DiagAuto AI (“Read fault codes”, pending codes included): P2463 (soot), P2002 (efficiency) and P2452 to P2455 (differential pressure sensor) do not point to the same repair.
2. Know what the app does not read: the DPF differential pressure, the soot load and the distance since the last regeneration are not part of the standard OBD2 data the app reads. A garage reads them with the manufacturer's tool. In the “Sensors” screen, however, look at what the car does provide: engine temperature, catalyst temperature, commanded EGR and EGR error.
3. Do a 30-minute drive at 110–130 km/h, then read the codes again. If P2463 does not come back when you regularly make this kind of trip, the problem is mainly your usage (short trips).
4. Check the sensor hoses (often 2 small pipes connected to the exhaust): flexible, not pinched, no cracks.
5. Check the additive level if your model uses one (dashboard message or reading with the manufacturer's tool).

Should you clear the code?

Not until the cause is fixed, especially for P2463: clearing does not empty the filter. DiagAuto AI clears engine codes when you ask it to, but it does not start any regeneration and does not reprogram anything. After a repair or a forced regeneration at the garage, the garage will clear the codes and reset the soot and ash counters (a manufacturer procedure).

Indicative cost

Indicative, France 2026. Differential pressure sensor: €50 – 150 fitted. Hoses: €20 – 60. Forced regeneration at the garage: €60 – 150. DPF cleaning (hydrodynamic, filter removed): €250 – 500. New aftermarket DPF: €500 – 1,200 fitted; original part: €1,200 – 2,500.

Read also: Loss of power on hills: limp mode and Buying a used car: scan it before you sign.