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Our automotive experts have put together the following information about the P0921 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 P0921 code.

OBD II Fault Code

  • OBD II P0921

    OBD-II Code Transmission may not shift properly is defined as a Gear Shift Forward Actuator Circuit Range/Performance

    The Transmission is responsible for converting the power produced by the engine to movement of the vehicle. The transmission has its own control module (TCM). The TCM uses solenoids to control the fluid pressure that activates the different gears inside the transmission. If the TCM sees an implausible signal from the shift solenoid, code P0921 will be set.

    Transmission may not shift properly Symptoms

    • Increased fuel consumption
    • Transmission may not shift properly

    Common Problems That Trigger the P0921 Code

    • Gear shift actuator assembly failure
    • Transmission Control Module (TCM) failure
    • Wiring issue
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