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Our automotive experts have put together the following information about the P20C9 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 P20C9 code.

OBD II Fault Code

  • OBD II P20C9

    OBD-II Code Diagonostic Trouble Code is defined as a Reductant Control Module Requested MIL Illumination

    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. Code P20CA is set when a fault is detected in the DPF system. Additional codes may be stored in the Reductant Control Module.

    Diagonostic Trouble Code Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P20C9 Code

    • There is a fault in the reductant system that requires additional diagnostics.
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