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P2002

Diesel particulate filter efficiency below threshold

The ECU has detected that diesel particulate filter performance is below the expected threshold.

What this code means

The ECU has detected that diesel particulate filter performance is below the expected threshold.

Possible causes

  • DPF soot loading or blockage
  • Failed regeneration
  • Exhaust leak
  • DPF pressure-sensor or hose problem
  • Damaged DPF

Common symptoms

  • Check engine light
  • Possible reduced power or regeneration warning
  • Higher fuel consumption
  • Possible visible soot

Checks to make

  1. Check soot-load and differential-pressure data
  2. Check for related exhaust-temperature or pressure-sensor codes
  3. Inspect pressure hoses and exhaust for leaks
  4. Follow manufacturer regeneration procedures

Safety

  • Do not replace parts from the code alone. Confirm the fault with live data, wiring checks and manufacturer procedures. Keep clear of hot or moving engine components.

Model notes

The code definition is generic; exact diagnostic thresholds, component locations and repair procedures vary by vehicle.