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Our automotive experts have put together the following information about the P2551 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 P2551 code.

OBD II Fault Code

  • OBD II P2551

    OBD-II Code Transmission may not shift properly is defined as a Torque Management Request Input Signal "B" High

    The Transmission Control Module and the engine computer (PCM) constantly talk to each other to ensure that they are working together to produce the desired power output. If the two modules fail to communicate with each other, code P2551 is set.

    Transmission may not shift properly Symptoms

    • Transmission may not shift properly

    Common Problems That Trigger the P2551 Code

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

    Common Repairs Needed for the P2551 Code

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