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P2002 fault code: what it means

P2002: Diesel particulate filter (DPF) efficiency is below the limit; the filter may be cracked or the pressure reading is wrong.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. split, blocked or swapped DPF pressure sensor hoses
  2. faulty DPF pressure sensor
  3. cracked or melted DPF
  4. exhaust leak before the DPF

P2002 by make

Audi

Diesel particulate filter (DPF) not working as expected. On VW group TDI short trips and the pressure sensor are more likely than a dead DPF.

Usual causes: soot build-up from short trips (missed regenerations); failed DPF differential pressure sensor (G450) or hoses; exhaust leak before the DPF; ash-full or cracked DPF (high km)

BMW

Diesel particulate filter (DPF) efficiency low. On BMW diesels check the DPF pressure sensor and its pipes before the filter.

Usual causes: DPF damaged or worn; DPF pressure sensor or its hoses; EGR / injector faults causing heavy soot

Ford

DPF efficiency below threshold: the diesel particulate filter is not cleaning the exhaust properly. Very common on short-trip Ranger/Everest 3.2, 2.2 and 2.0 bi-turbo.

Usual causes: DPF blocked from short trips (regens not finishing); DPF pressure sensor or its hoses; cracked or damaged DPF; extra soot from injectors, EGR or boost leaks

GWM

DPF efficiency below threshold (2.0 diesel with DPF).

Usual causes: failed or cracked DPF; DPF pressure sensor or hoses; exhaust leak

Holden

DPF efficiency below threshold: the filter is not working well enough, usually from heavy soot load. Seen on 2.8 Duramax Colorado.

Usual causes: DPF blocked from short trips; DPF pressure sensor or pipes; cracked or melted DPF after a heavy regen

Hyundai

Diesel particulate filter efficiency below threshold (CRDi diesels). Usually a blocked DPF.

Usual causes: DPF clogged from short-trip driving (no regeneration); faulty DPF differential pressure sensor or its hoses; upstream fault making extra soot (EGR, injectors)

Isuzu

Diesel particulate filter (DPD) efficiency below threshold, or the DPD is overloaded. Power may be cut and EGR disabled.

Usual causes: DPD overloaded from short trips or failed regenerations; faulty DPD differential pressure sensor; failed or cracked DPD

Jeep

DPF efficiency below threshold on 3.0 CRD/EcoDiesel.

Usual causes: failed or cracked DPF; DPF pressure sensor or hoses; exhaust leak

Kia

Diesel particulate filter efficiency below threshold (2.0 / 2.2 CRDi Sportage, Sorento, Carnival). Usually a blocked DPF.

Usual causes: DPF clogged from short-trip driving (no regeneration); faulty DPF differential pressure sensor or its hoses; upstream fault making extra soot (EGR, injectors)

Land Rover

Diesel particulate filter efficiency below threshold: the DPF is not trapping soot properly or the reading is wrong.

Usual causes: failed or cracked DPF; DPF differential pressure sensor or pipes; exhaust leak before the DPF

LDV

DPF efficiency below threshold.

Usual causes: failed or cracked DPF; DPF pressure sensor or hoses; exhaust leak

Mazda

SkyActiv-D: DPF pressure drop too LOW, so Mazda reads the DPF as not working. Often the sensor pipe; can mean a cracked or damaged DPF.

Usual causes: pressure sensor pipe to DPF blocked, split or misrouted; exhaust gas pressure sensor No.2; exhaust leak; cracked or damaged DPF

Mercedes-Benz

Diesel particulate filter (DPF) efficiency below threshold. On Mercedes CDI/BlueTEC often the DPF pressure sensor or its hoses, not the filter itself.

Usual causes: split or blocked DPF pressure sensor hoses; faulty DPF pressure sensor; cracked DPF

Mini

Diesel particulate filter efficiency low.

Usual causes: DPF damaged or worn; DPF pressure sensor or its hoses

Mitsubishi

DPF efficiency below threshold. On 4N15 Triton / Pajero Sport the filter is blocked or the system judges it not working.

Usual causes: DPF blocked from failed or interrupted regenerations (short trips); worn injectors making extra soot; faulty DPF differential pressure sensor or blocked sensor pipes; DPF cracked or damaged

Nissan

Diesel particulate filter (DPF) efficiency below threshold: soot not clearing (Navara D23/NP300 YD25).

Usual causes: DPF overloaded with soot (short trips); DPF differential pressure sensor fault; EGR or injector fault making extra soot; degraded engine oil stopping regeneration

Skoda

DPF not working as expected. On Skoda TDI, short trips and the pressure sensor come before a dead DPF; some Superb (3U) had faulty factory pressure sensors.

Usual causes: soot build-up from short trips (missed regenerations); failed DPF differential pressure sensor (G450) or hoses; exhaust leak before the DPF; ash-full or cracked DPF (high km)

Toyota

DPF efficiency below threshold on 1GD/2GD diesels: the filter is not trapping or cleaning soot as expected, often after failed regenerations.

Usual causes: blocked exhaust fuel addition (5th) injector stopping regeneration; damaged or cracked DPF; faulty DPF pressure sensor or hoses

Volkswagen

Diesel particulate filter (DPF) not working as expected. On VW group TDI short trips and the pressure sensor are more likely than a dead DPF.

Usual causes: soot build-up from short trips (missed regenerations); failed DPF differential pressure sensor (G450) or hoses; exhaust leak before the DPF; ash-full or cracked DPF (high km)

Volvo

DPF efficiency below threshold (D5/D4 diesel).

Usual causes: failed or cracked DPF; DPF pressure sensor or hoses; exhaust leak

What the repair usually costs

Not sure what P2002 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.