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OBD II Fault Code

  • OBD II P0978

    OBD-II Code Transmission may not shift properly is defined as a Shift Solenoid "C" Control Circuit Range/Performance

    The Transmission Control Module (TCM) uses Shift Solenoids to control the hydraulic pressure in the transmission which is needed to apply the various clutch packs in the transmission that provide the different gear ratios needed to efficiently propel the vehicle down the road. When the TCM detects a pressure control solenoid is not performing as desired, it will set code P0978.

    Transmission may not shift properly Symptoms

    • Increased fuel consumption
    • Transmission may not shift properly

    Common Problems That Trigger the P0978 Code

    • Transmission Control Module (TCM) failure
    • Transmission fluid level is low
    • Transmission shift solenoid failure
    • Wiring issue

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