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P2003

Diesel Particulate Filter Efficiency Below Threshold (Bank 2)

Diesel Particulate Filter Efficiency Below Threshold (Bank 2): the control module has detected this fault condition.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: hard

Symptoms

  • Check engine light or DPF warning light on
  • Power loss / limp mode
  • Increased fuel consumption
  • Failed forced regeneration attempts

Common causes

Ordered by how often each turns out to be the cause.

  • DPF heavily loaded — repeated short trips prevent regenerationCommon
  • Filter substrate cracked or meltedPossible

Parts involved

  • Diesel Particulate Filter
  • DPF Differential Pressure Sensor
  • DPF Temperature Sensor

P2003 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.