P2003 - OBD II Trouble Code

Our automotive experts have put together the following information about the P2003 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P2003 code.

What Does P2003 Code Mean?

OBD-II Code P2003 is defined as a Diesel Particulate Filter Efficiency Below Threshold

Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases. In order to burn off those particles, the temperature of the exhaust system needs to increase. the injection of DEF Fluid into the exhaust stream brings Diesel Particulate Filter (DPF) up to temperature. The system is then able to convert harmful NOx to Nitrogen, Carbon Dioxide, and water. The Reductant Catalyst (SRC) was added to further reduce any NOx was still in the exhaust stream. If the DPF cannot sufficiently burn off all the particles, code P2003 is set.

Common Problems That Trigger the P2003 Code

• Diesel Particulate Filter (DPF) failure
• Intake air leak
• Mass Airflow (MAF) sensor is dirty/loss of calibration