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OBD II Fault Code

  • OBD II P0669

    OBD-II Code Transmission may not shift properly is defined as a PCM/ECM/TCM Internal Temperature Sensor "A" Circuit High

    The engine control module (PCM) and/or Transmission Control Module has a temperature sensor built in to prevent the module from overheating. If the control module cannot accurately determine its own temperature, it will set code P0669.

    Transmission may not shift properly Symptoms

    • Decreased engine performance
    • Transmission may not shift properly

    Common Problems That Trigger the P0669 Code

    • Powertrain Control Module (PCM) failure
    • Transmission Control Module (TCM) failure
    • Wiring issue
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