OBD II Fault Code

  • OBD II P0591

    OBD-II Code Cruise control will not operate is defined as a Cruise Control Multi-Function Input "B" Circuit Range/Performance

    The Cruise Control System uses several input switches (i.e. Coast and Accelerate) If the engine computer (PCM) sees a signal from more than one switch at a time, code P0591 will set and the cruise control system will be disabled.

    Cruise control will not operate Symptoms

    • Cruise control will not operate

    Common Problems That Trigger the P0591 Code

    • Cruise control switch failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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