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OBD code information sheet

https://dvireports.com/p2003

Fault codes DVI Reports
P2003

Particulate Filter Efficiency Below Threshold Bank 2

Safe to keep driving?Risk not classifiedDepends on symptoms

A supported severity assessment is not available for this code. The code alone cannot establish safe driving. Stop for red warnings, low oil pressure, overheating, abnormal braking or severely rough running.

LowCautionCritical

No green/yellow/red level was assigned without sufficient evidence.

System groupEmissions & exhaustParticulate filter

Technical explanation

Particulate Filter Efficiency Below Threshold Bank 2. Basic catalogue definition; diagnostic details have not yet been reviewed.

Symptoms

  • Warning light may illuminate

  • Related system function may be impaired

  • Vehicle-specific symptoms vary

Possible causes

Possible causes to investigate, not a statistical ranking or a parts-replacement list.

  1. Exhaust or emissions plumbing leak, restriction, valve fault, sensor fault, or damaged wiring

  2. Related wiring, connector, power or ground fault

  3. Vehicle-specific mechanical or control issue

Step-by-step diagnosis

Checks

Work through the steps before replacing parts. Adapt the checks to the manufacturer’s procedure.

  1. Record stored and pending codes and freeze-frame data

  2. Inspect the relevant exhaust or emissions plumbing and electrical connections, then compare commanded operation with sensor feedback during the enable conditions.

  3. Confirm measured values against the vehicle service information

  4. Retest under the conditions that set the code

  5. Inspect the relevant exhaust or emissions plumbing and electrical connections, then compare commanded operation with sensor feedback during the enable conditions.

  6. Repair the verified cause and confirm the code does not return

Check the fuses before ordering a part

An OBD code describes a detected condition; it does not tell you which part to replace. Start with the fuse for the affected circuit.

Find the fuse for your vehicleChoose the make and model, then look up the fuse position in the catalogue.

If the fuse is good, carry on like this:

  1. Check the relevant supplies and connectionsWhere the diagnostic procedure calls for electrical checks, verify supply, ground and connectors under the manufacturer’s activation conditions.
  2. Run the specified component testUse the manufacturer’s test for this code and component before deciding it has failed.
  3. Order only after the fault is demonstratedReplace a part only when the prescribed tests identify it as defective.
Check details
  • Identify the circuit and any relevant fuse: Confirm the vehicle, engine, code meaning and stored operating conditions first. A fuse link is a location aid, not evidence that the fuse caused this code. Use the specified type and rating; do not repeatedly replace a fuse that opens.
  • Check the relevant supplies and connections: Use the specified engine state, circuit conditions and expected values. Have live measurements performed by someone qualified. For non-electrical faults, follow the relevant mechanical, fluid, pressure or leak checks instead.
  • Run the specified component test: Do not apply a generic resistance range. Any resistance or continuity test requires a de-energized circuit and an isolated component, with the correct pins and temperature from the procedure. Some components need a different kind of test.
  • Order only after the fault is demonstrated: If results are normal, continue the relevant wiring, control, mechanical or intermittent diagnosis. Check for related faults and verify the repair under the required conditions. A code or a completed checklist alone does not justify replacement.
Fluke · Continuity testing

If the procedure involves airbag/SRS, pretensioners or a high-voltage system, stop DIY testing and use qualified service. Do not probe these circuits with a multimeter.

Vehicle experiences and cases

User-reported cases published after moderation. Approval does not verify the diagnosis; the same code can have different causes.

No experiences have been published for this definition yet. You can be the first to share the checks and outcome.

See all vehicle experiences

Manuals, components and vehicle guides

Find the relevant procedure in the workshop manual for your vehicle. A fault code alone does not identify a failed part, powertrain or exact schematic.

Find workshop manual / diagramRelated issues and checks

Manuals open at their original source. Exact diagram availability depends on the build year, engine and manufacturer access.

Particulate filtration and pressure measurement

General system guidance · not a confirmed diagnosis

Separate filtration efficiency, soot accumulation and measurement faults; these are different diagnostic conditions.

The association is based on the imported description. This information explains the system; it does not confirm a procedure for the exact code, model or engine. Verify applicability in manufacturer documentation.

Checks for this type of system

  1. Confirm the definition and related codes before considering regeneration.
  2. Check sensors and pressure pipes where fitted.
  3. Request filter-integrity and regeneration-condition assessment.

Useful diagnostic data, where available

  • Differential pressure and available temperatures.
  • Calculated loading and regeneration history where supported.

Normal values and thresholds vary by vehicle and are not assumed here.

Mistakes to avoid

  • Do not command regeneration merely because a DPF code exists.
  • Soot and ash are not removed by the same process.
System-guide sources

References support general principles, not individual verification of every associated code.

Continue your research

Links to related systems, warning lights and vehicle examples.

Check Engine light: meaning and urgencyRead the code with an OBD scanner

Similar codes

P2000Risk not classified

General code

NOx adsorber efficiency, bank 1 — efficiency below threshold

Emissions & exhaust · NOx adsorption aftertreatment

Open sheet
P2001Caution / Repair soon

General code

NOx Adsorber Efficiency Below Threshold Bank 2

Engine & powertrain

Open sheet
P2002Low / Informational

General code

Particulate filter efficiency below threshold — bank 1

Emissions & exhaust · Particulate filtration

Open sheet
Report a problem

What should be corrected in this sheet? Do not include names, phone numbers, registration plates or VINs.

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