Code Definition

P2003 — Particulate Trap Efficiency Below Threshold - Bank 2

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2003

P2003 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2003 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2003 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Engine Control Module (ECM) monitors the diesel particulate filter (DPF) on Bank 2 by comparing inlet and outlet exhaust gas pressure and exhaust gas temperature sensor data to determine soot trapping efficiency. DTC P2003 is set when the measured soot capture performance of the DPF on Bank 2 falls below the manufacturer's calibrated threshold, indicating that the filter is not effectively collecting particulate matter, or that the sensors interpreting its behaviour are misleading the ECM. The DPF is a honeycomb ceramic trap positioned in the exhaust stream that captures soot during normal...

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