OBD II Fault Code

  • OBD II P256B

    OBD-II Code Engine may stall is defined as a Engine Idle Speed Selector Sensor/Switch Range/Performance

    The Idle Control Valve (Idle Speed Selector overseas) controls the engine's idle speed. If the idle speed can not be properly maintained as requested by the engine computer, code P256B will be stored.

    Engine may stall Symptoms

    • Engine may stall

    Common Problems That Trigger the P256B Code

    • Idle Air Control (IAC) valve failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

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