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OBD II Fault Code

  • OBD II P078A

    OBD-II Code Transmission may not shift properly is defined as a Shift Timing Solenoid "B"

    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 roadways. When the TCM detects a shift solenoid is not performing as desired, it will set code P078A.

    Transmission may not shift properly Symptoms

    • Increased fuel consumption
    • Transmission may not shift properly

    Common Problems That Trigger the P078A Code

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