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What Does P2638 Code Mean?

    OBD-II Code P2638 is defined as a Torque Management Feedback Signal "A" Range/Performance

    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 P2638 is set.

    P2638 Symptoms

    • Transmission may not shift properly

    Common Problems That Trigger the P2638 Code

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

    Common Repairs Needed for the P2638 Code

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