P202B - OBD II Trouble Code

Our automotive experts have put together the following information about the P202B 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 P202B code.

What Does P202B Code Mean?

    OBD-II Code P202B is defined as a Reductant Tank Heater Control Circuit Low

    Newer diesel vehicles have a Diesel Particulate Filter to reduce soot emissions. This filter uses DEF Fluid to assist in the burning off soot. 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 P202B.

    P202B Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P202B Code

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

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