P2002 — Diesel Particulate Filter Efficiency Below Threshold (Bank 1) — 6.7 Powerstroke
Diagnostic reference for P2002 on 6.7 Powerstroke (2011–present).
What it means
The PCM judges DPF filtering efficiency, using pressure/temperature data, to be below threshold.1
Most likely causes
- Cracked or ash-loaded DPF — Physical restriction or loss of filtration reduces measured efficiency.1
- Failed DPF differential-pressure sensor or plugged sample tubes — Incorrect pressure readings cause the PCM to calculate low efficiency.12
- Repeated interrupted regenerations — Incomplete burn cycles increase soot load and lower apparent efficiency.1
- Excess soot production from engine faults — More soot reaches the DPF, raising differential pressure and regeneration frequency.3
- EGT sensor fault affecting regeneration control — Implausible exhaust gas temperature readings can disrupt regeneration.4
How to diagnose
- Verify freeze-frame and confirm P2002 is active with no accompanying sensor-circuit codes.
- Inspect DPF differential-pressure sensor readings at idle and under load; compare to expected values.
- Check DPF pressure sample tubes for soot plugging or leaks.
- Review regeneration history for frequent or aborted regenerations.
- Inspect for engine conditions that increase soot: injector performance, EGR operation, turbo boost, intake leaks.
- Check exhaust gas temperature sensor plausibility for bank 1 sensor 3.
- Perform a controlled road test to monitor DPF pressure delta vs. temperature and engine load.
Common mistake to avoid
Cleaning or replacing the DPF before checking its pressure sensor and tubes. Cracked, melted, plugged or wet sensor tubes, or a failing sensor, can set DPF codes while the filter itself is fine. They are cheap to check; clear and verify them before touching the filter. Source: FleetRabbit — P2002 DPF efficiency code causes and fixes.
Parts and tools you may need
- Scan tool with live data for DPF pressure, EGT, regeneration status
- Manometer or calibrated pressure gauge for DPF delta-P verification
- Basic hand tools for sensor and tube inspection
Tools you’ll need
- OBD-II scan tool — Reads P2002 live data and freeze-frame to confirm active DPF efficiency fault without sensor-circuit codes.
- digital multimeter — Verifies DPF differential-pressure sensor supply, ground, and signal voltages against spec at idle and load.
- exhaust backpressure gauge — Measures actual DPF delta pressure under load to compare with sensor readings and confirm plugging or cracking.
- borescope — Inspects DPF substrate and pressure sample tubes for ash loading, cracks, or soot plugging without removal.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Scan-tool forced (parked) regeneration | — | 0.5–1.5 hrs | DIY with tools and a manual |
| Exhaust gas temperature sensor | $50–$250 | 0.5–1.5 hrs | DIY with tools and a manual |
| DPF differential pressure sensor | $80–$300 | 0.5–1.5 hrs | Easy DIY |
| DPF professional cleaning (bake and blow) | $300–$700 | 1–3 hrs | Shop |
Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.
When to see a pro
If diagnosis points to internal DPF failure, high-pressure fuel system, or requires removal of aftertreatment components, have a qualified diesel technician perform the work.
Check for recalls
Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.
Sources
Repair videos: P2002 on the 6.7 Power Stroke
Third-party videos, not ours — picked for this engine. Confirm anything against the factory service information for your truck.
Spotted an error, or something missing? Tell us
Run a 6.7 Powerstroke? This goes straight to the editor — it is not published.