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Our automotive experts have put together the following information about the P0861 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 P0861 code.

OBD II Fault Code

  • OBD II P0861

    OBD-II Code Transmission may not shift properly is defined as a Gear Shift Control Module "A" Communication Circuit Low

    The Transmission Control Module (TCM) and the engine computer (PCM) constantly talk to each other to ensure that the driver's request for performance is met. If the TCM and PCM fail to communicate, code P0861 is stored.

    Transmission may not shift properly Symptoms

    • Engine may not start
    • Transmission may not shift properly

    Common Problems That Trigger the P0861 Code

    • Powertrain Control Module (PCM) failure
    • Transmission Control Module (TCM) failure
    • Wiring issue
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