Close

OBD II Fault Code

  • OBD II P099B

    OBD-II Code Transmission may not shift properly is defined as a Shift Solenoid "G" Control Circuit Low

    The Transmission Fluid Pressure Solenoid allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the electrical circuit to or from this solenoid, the PCM or TCM will set code P099B.

    Transmission may not shift properly Symptoms

    • Increased fuel consumption
    • Transmission may not shift properly

    Common Problems That Trigger the P099B Code

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

    Not the OBD-II Code You're Looking For?

    No comments yet...

    Sign in to comment