DPF Efficiency Below Threshold
The POWERSTROKE-P2002 (Power Stroke) diesel fault code means: DPF Efficiency Below Threshold. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- advanced
- Estimated cost
- $400-$3,500
Down with a Power Stroke fault on the road?
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Common Symptoms
- CEL
- Limp mode
- Reduced power
Probable Causes (Ranked by Likelihood)
- DPF loaded or plugged Very Likely
- Failed DPF pressure sensor Likely
- Cracked DPF substrate from runaway regen Possible
Frequently Asked Questions
What is P2002 on a 6.4L Power Stroke?
P2002 on a 6.4L Power Stroke (2008-2010) indicates: DPF Efficiency Below Threshold. This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.
Can I drive with P2002 on my Power Stroke?
Only drive short distances to get to a repair facility. Continued operation may cause further damage.
How much does it cost to fix P2002?
Repair cost is typically $400-$3,500 depending on the underlying cause and whether you DIY or use a shop. Diagnostic time alone runs $100-$180 at most independent diesel shops.
Mechanics Guide Step-by-step diagnosis, and what most sources get wrong
Step-by-Step Diagnostic Procedure
Check DPF delta-P sensor PIDs on scan tool.
Run a forced regen; if DPF won't clear, remove and inspect for cracks.
Replace or clean DPF as needed.
Common Misconceptions / Fact Check
-
Commonly claimedP2002 is usually read as "the DPF is plugged," and the first move is a forced regeneration.
VerifiedRestriction and efficiency are different faults with different codes behind them. A plugged filter shows up in differential pressure — that is the P244B family. P2002 is the filtering-performance criterion: the system has judged the filter is no longer trapping particulate to the required standard, which is the opposite failure. A substrate that is cracked, melted or partially hollowed out lets exhaust through too easily, so a forced regen has nothing to burn off and will not change the result. Worth reading the differential pressure before assuming which of the two you have.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- California Air Resources Board, Title 13 CCR 1968.2 (2006 final regulation order)§(f)(9.2.1) sets the diesel particulate filter’s filtering-performance limits and §(f)(9.2.2) makes regeneration frequency a separate malfunction criterion
- SAE J2012Diagnostic Trouble Code Definitions (defines P2002 as a generic OBD-II code)
P2002 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Commonly Affected Vehicles
- 2008-2010 Ford F-250 Super Duty 6.4L Power Stroke
- 2008-2010 Ford F-350 Super Duty 6.4L Power Stroke
- 2008-2010 Ford F-450/F-550 Super Duty 6.4L Power Stroke
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