Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
The P2002 code means the vehicle's onboard diagnostic system has detected: Diesel Particulate Filter Efficiency Below Threshold (Bank 1). This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $1,000 - $3,500 (parts and labor)
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What Are the Symptoms of P2002?
- Check Engine Light on
- Reduced engine power or limp mode
- Excessive black smoke from exhaust
- Frequent DPF regeneration attempts
- Poor fuel economy
What Causes P2002? (Most Likely First)
- Clogged or damaged diesel particulate filter Very High
- Failed DPF regeneration due to short trips High
- Faulty DPF differential pressure sensor Moderate
- Exhaust leak before DPF Moderate
- Turbocharger oil leak contaminating DPF Low
Can I Still Drive with P2002?
Short distances only. P2002 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2002 mean?
P2002 indicates the diesel particulate filter on Bank 1 is not trapping soot particles efficiently, often because the filter is clogged or damaged beyond regeneration capability.
Can I drive with a P2002 code?
You can drive short distances, but the vehicle may enter limp mode. Continued driving with a clogged DPF can cause turbo damage and expensive repairs.
How much does it cost to fix P2002?
A forced regeneration may cost $100-$300. DPF cleaning runs $300-$600. Full DPF replacement costs $1,500-$3,500 depending on the vehicle.
What actually makes the computer set this particulate filter code?
California's OBD II regulation requires the system to flag a PM trap before its capability drops enough to push emissions past 1.5 times the applicable standards (Title 13 CCR 1968.2, section (e)(15.2)). Note the scope: that criterion is written for diesel passenger cars, light-duty trucks and medium-duty passenger vehicles certified to a chassis dynamometer standard. Heavy-duty engines are governed by a separate regulation, so a filter code on a big truck is not set by this rule. This is the threshold the monitor is designed around, not a description of your specific fault — the regulation says what the system must detect, not how to find it on your vehicle.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2002?
-
Read freeze frame data and note DPF soot loading percentage
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Check DPF differential pressure sensor readings at idle and under load
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Attempt a forced DPF regeneration with scan tool
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Inspect DPF for physical damage, cracks, or excessive soot loading
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- California Code of Regulations, Title 13 section 1968.2 (OBD II)malfunction criteria, section (e)
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
P2002 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Which Vehicles Commonly Get P2002?
- 2011-2019 Ford F-250 6.7L Power Stroke
- 2013-2020 Ram 2500 6.7L Cummins
- 2011-2019 Chevrolet Silverado 2500 6.6L Duramax
- 2009-2015 Volkswagen Jetta 2.0L TDI
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