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Home / DTC / P2002 — Particulate Filter Efficiency Below Threshold Bank 1

P2002 — Particulate Filter Efficiency Below Threshold Bank 1

Detailed page for trouble code P2002.

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P2002

Generic P — Powertrain

Particulate Filter Efficiency Below Threshold Bank 1

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged/sooted DPF from extended short trips or failed regen
  • Failed or out-of-calibration differential pressure sensor or DPF pressure circuit
  • Faulty upstream or downstream exhaust temperature sensors
  • Exhaust leaks between sensors and DPF (false readings)
  • Excessive soot generation (overfueling, leaking injectors, turbo faults, stuck-open EGR)
  • DPF damaged, contaminated with oil or coolant, or physically missing/modified

Symptoms

  • MIL (Check Engine) illuminated with P2002 stored
  • Reduced engine performance or limp-home mode (on some vehicles)
  • Increased fuel consumption
  • Frequent or failed regeneration attempts
  • Visible black smoke under acceleration
  • Noticeable exhaust restriction or unusual exhaust noise

What to check

  • Read DTCs and freeze-frame data; note related or pending codes (sensors, fuel, turbo, EGR)
  • Check live data: DPF differential pressure, upstream/downstream exhaust temps, soot/soot% or DPF load indication, lambda sensor voltages
  • Visually inspect DPF, exhaust joints, clamps and flexible pipes for leaks or damage
  • Inspect and backprobe pressure and temperature sensors and their wiring/connectors for open/short/corrosion
  • Check vehicle history for recent oil consumption, coolant loss, or missed regens
  • Verify fuel pressure and injector operation if overfueling suspected

Signal parameters

  • DPF differential pressure (mbar or kPa) — should be low at idle and rise with load; persistent high values indicate restriction
  • Upstream (pre-DPF) exhaust temperature — rises during regen (typically several hundred °C)
  • Downstream (post-DPF) exhaust temperature — normally lower than upstream; during regen delta T often >50–100°C
  • DPF soot load or DPF soot % / DPF fullness (scan-tool value) — indicates accumulated soot
  • Upstream lambda/O2 sensor voltage (switching) and downstream lambda stability — help assess filter/catalyst function
  • Short-term and long-term fuel trim (%) and commanded fuel rail pressure — overfueling symptoms

Diagnostic algorithm

  1. Record all stored and pending codes and freeze-frame data. Do not remove codes yet.
  2. Review vehicle history: driving patterns, recent repairs, oil or coolant consumption, and previous forced regens.
  3. Use a scan tool to monitor DPF-related data: differential pressure, soot load/DPF %, upstream/downstream temps, lambda readings, and regen status during idle and road load.
  4. Visually inspect DPF, piping, flanges and sensor connectors; check for exhaust leaks, damage or evidence of oil/coolant contamination.
  5. Confirm sensor operation: backprobe and compare differential pressure sensor and temperature sensor outputs to expected behavior; check sensor supply/grounds.
  6. If sensors and wiring are good but soot load is high, attempt a commanded/forced regeneration following manufacturer procedures in a safe, well-ventilated area.
  7. If regeneration fails or soot does not reduce, perform further tests: assess injector condition and fuel pressure, check turbocharger for oil leakage, and verify EGR operation.
  8. If DPF is confirmed physically clogged, contaminated, or damaged, consider professional cleaning or replacement of the DPF assembly and replacement of any contaminated sensors.
  9. After repair or cleaning, clear codes, perform required relearns/resets, and complete road test with verification scans to ensure DPF efficiency code does not return.
  10. If code persists, consider ECM software update or replacement after confirming all sensors and hardware are serviceable.

Likely causes

  • High soot loading in the DPF (physically restricted filter)
  • Differential pressure sensor failure or clogged sensor lines
  • Upstream/downstream temperature sensor failure or wiring issues
  • Exhaust leak between upstream sensor and DPF or between DPF and downstream sensor
  • Fuel system fault (leaking/injector overfueling) or turbocharger oil seal failure causing oil contamination
  • EGR stuck open or excessive EGR flow increasing soot production

Fault status

⚠️ Status
Particulate filter efficiency below threshold — Bank 1
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1-4 hours

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Code

P2002

LAND ROVER P — Powertrain

The efficiency of the diesel particulate filter is below the limit (bank 1)

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged/sooted DPF from extended short trips or failed regen
  • Failed or out-of-calibration differential pressure sensor or DPF pressure circuit
  • Faulty upstream or downstream exhaust temperature sensors
  • Exhaust leaks between sensors and DPF (false readings)
  • Excessive soot generation (overfueling, leaking injectors, turbo faults, stuck-open EGR)
  • DPF damaged, contaminated with oil or coolant, or physically missing/modified

Symptoms

  • MIL (Check Engine) illuminated with P2002 stored
  • Reduced engine performance or limp-home mode (on some vehicles)
  • Increased fuel consumption
  • Frequent or failed regeneration attempts
  • Visible black smoke under acceleration
  • Noticeable exhaust restriction or unusual exhaust noise

What to check

  • Read DTCs and freeze-frame data; note related or pending codes (sensors, fuel, turbo, EGR)
  • Check live data: DPF differential pressure, upstream/downstream exhaust temps, soot/soot% or DPF load indication, lambda sensor voltages
  • Visually inspect DPF, exhaust joints, clamps and flexible pipes for leaks or damage
  • Inspect and backprobe pressure and temperature sensors and their wiring/connectors for open/short/corrosion
  • Check vehicle history for recent oil consumption, coolant loss, or missed regens
  • Verify fuel pressure and injector operation if overfueling suspected

Signal parameters

  • DPF differential pressure (mbar or kPa) — should be low at idle and rise with load; persistent high values indicate restriction
  • Upstream (pre-DPF) exhaust temperature — rises during regen (typically several hundred °C)
  • Downstream (post-DPF) exhaust temperature — normally lower than upstream; during regen delta T often >50–100°C
  • DPF soot load or DPF soot % / DPF fullness (scan-tool value) — indicates accumulated soot
  • Upstream lambda/O2 sensor voltage (switching) and downstream lambda stability — help assess filter/catalyst function
  • Short-term and long-term fuel trim (%) and commanded fuel rail pressure — overfueling symptoms

Diagnostic algorithm

  1. Record all stored and pending codes and freeze-frame data. Do not remove codes yet.
  2. Review vehicle history: driving patterns, recent repairs, oil or coolant consumption, and previous forced regens.
  3. Use a scan tool to monitor DPF-related data: differential pressure, soot load/DPF %, upstream/downstream temps, lambda readings, and regen status during idle and road load.
  4. Visually inspect DPF, piping, flanges and sensor connectors; check for exhaust leaks, damage or evidence of oil/coolant contamination.
  5. Confirm sensor operation: backprobe and compare differential pressure sensor and temperature sensor outputs to expected behavior; check sensor supply/grounds.
  6. If sensors and wiring are good but soot load is high, attempt a commanded/forced regeneration following manufacturer procedures in a safe, well-ventilated area.
  7. If regeneration fails or soot does not reduce, perform further tests: assess injector condition and fuel pressure, check turbocharger for oil leakage, and verify EGR operation.
  8. If DPF is confirmed physically clogged, contaminated, or damaged, consider professional cleaning or replacement of the DPF assembly and replacement of any contaminated sensors.
  9. After repair or cleaning, clear codes, perform required relearns/resets, and complete road test with verification scans to ensure DPF efficiency code does not return.
  10. If code persists, consider ECM software update or replacement after confirming all sensors and hardware are serviceable.

Likely causes

  • High soot loading in the DPF (physically restricted filter)
  • Differential pressure sensor failure or clogged sensor lines
  • Upstream/downstream temperature sensor failure or wiring issues
  • Exhaust leak between upstream sensor and DPF or between DPF and downstream sensor
  • Fuel system fault (leaking/injector overfueling) or turbocharger oil seal failure causing oil contamination
  • EGR stuck open or excessive EGR flow increasing soot production

Fault status

⚠️ Status
Particulate filter efficiency below threshold — Bank 1
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1-4 hours

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