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Our automotive experts have put together the following information about the P2042 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 P2042 code.

OBD II Fault Code

  • OBD II P2042

    OBD-II Code Reductant Temperature Sensor Circuit is defined as a Reductant Temperature Sensor Circuit

    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 Temperature Sensor tells the engine computer (PCM) the temperature of the DEF in the tank. If the PCM detects an implausible signal from the Reductant Temperature Sensor, code P2042 is set.

    Common Problems That Trigger the P2042 Code

    • DEF tank is damaged
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