Powertrain
Definition only
Lights the check engine lamp
P2003: Diesel Particulate Filter Efficiency Below Threshold (Bank 2)
Standardized SAE J2012 code · P20xx — Fuel & air metering and auxiliary emission controls
What does P2003 mean?
Diesel Particulate Filter Efficiency Below Threshold (Bank 2): the control module has detected this fault condition.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Common causes
- High DPF heavily loaded — repeated short trips prevent regeneration
- Medium Filter substrate cracked or melted
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2003 on the same make and model first.
P2003 in the community
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