Diesel Particulate Filter Efficiency Below Threshold (Bank 2)
The P2003 code means the vehicle's onboard diagnostic system has detected: Diesel Particulate Filter Efficiency Below Threshold (Bank 2). 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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Common Symptoms
- Check Engine Light illuminated
- Limp mode or reduced power
- Black smoke from exhaust
- DPF warning light on dashboard
- Increased fuel consumption
Probable Causes (Ranked by Likelihood)
- Clogged diesel particulate filter on Bank 2 Very High
- Insufficient DPF regeneration cycles High
- Faulty DPF pressure sensor on Bank 2 Moderate
- Exhaust leak upstream of Bank 2 DPF Moderate
- Injector issue causing excess soot Low
Step-by-Step Diagnostic Procedure
-
Confirm P2003 with freeze frame data and check soot loading levels
-
Test DPF differential pressure sensor on Bank 2
-
Perform forced regeneration and monitor exhaust temperatures
-
Inspect DPF substrate for melting, cracking, or excessive buildup
Frequently Asked Questions
What does P2003 mean?
P2003 means the Bank 2 diesel particulate filter cannot trap exhaust soot efficiently enough to meet emission standards, typically due to excessive clogging or physical damage.
Can I drive with a P2003 code?
Short-distance driving is possible but risky. The vehicle will likely enter limp mode, and continuing to drive can cause permanent DPF and turbo damage.
How much does it cost to fix P2003?
Costs range from $300 for professional DPF cleaning to $3,500 for full replacement, depending on the severity and vehicle model.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P2003 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:
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