DPF Efficiency Below Threshold
The YANMAR-P2002 (Yanmar) diesel fault code means: DPF Efficiency Below Threshold. This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- advanced
- Estimated cost
- $400-$3,500 clean / $4,000-$7,000 replace
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Common Symptoms
- Regen lamp, derate on SA424 / LX4900 / ViO80
Probable Causes (Ranked by Likelihood)
- Soot loaded DPF (short-duty cycle) Very Likely
- Ash loaded at service interval (3,000-5,000 hr) Likely
- Raw fuel contamination from injector leak Possible
Step-by-Step Diagnostic Procedure
Run parked regen via SmartAssist.
Monitor DPF differential pressure (should drop below 3 kPa post-regen).
If regen fails, professionally clean DPF.
Frequently Asked Questions
What is Yanmar code P2002?
Yanmar P2002: DPF Efficiency Below Threshold. This code is reported on Yanmar equipment running the described engine family.
Can I keep working with Yanmar code P2002?
Limited operation only -- finish the current task then shut down for repair.
How much does Yanmar P2002 cost to fix?
Typical repair cost: $400-$3,500 clean / $4,000-$7,000 replace. Off-road diesel shop labor runs $125-$175/hr in 2026. Dealer diagnostic software (Yanmar SmartAssist / YDT) is usually required.
P2002 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: