OBD II Fault Code

  • OBD II P0639

    OBD-II Code Decreased engine performance is defined as a Throttle Actuator Control Range/Performance

    The engine computer (PCM) monitor the movement of the throttle body to verify that it matches its commanded position. If the throttle body fails to move as requested, code P0639 will be set.

    Decreased engine performance Symptoms

    • Decreased engine performance

    Common Problems That Trigger the P0639 Code

    • Powertrain Control Module (PCM) failure
    • Throttle body assembly failure
    • Wiring issue
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