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OBD II Fault Code

  • OBD II P209F

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Reductant Tank Heater Control Circuit Performance

    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. The Reductant Tank Heater heats the DEF Fluid to the temperature is more efficient. If the engine control module (PCM) detects the Reductant Tank Heater is not operating properly, it will set code P209F.

    Powertrain Control Module (PCM) failure Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P209F Code

    • Powertrain Control Module (PCM) failure
    • Reductant tank heater control module failure
    • Reductant tank heater failure
    • Wiring issue
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