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OBD II Fault Code

  • OBD II P079B

    OBD-II Code Transmission may not shift properly is defined as a Transmission Friction Element "B" Slip Detected

    The Hybrid Control Module monitors the transmission clutches for slippage. If the Control Module detects any slippage in first gear or reverse, code P079B will be set. The hybrid control module may also place the vehicle in "limp home", limiting available engine/transmission performance to prevent additional damage.

    Transmission may not shift properly Symptoms

    • Engine may enter limp home mode (reduced performance)
    • Transmission may not shift properly

    Common Problems That Trigger the P079B Code

    • Internal transmission failure
    • Transmission fluid level is low
    • Transmission valve body solenoid failure
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