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OBD II Fault Code

  • OBD II P0665

    OBD-II Code Decreased engine performance is defined as a Intake Manifold Tuning Valve Control Circuit High

    The Intake Manifold Tuning Valve allows additional air to flow through the intake at higher RPMs. If the engine computer (PCM) detects that the Intake Manifold Tuning Valve is not operating as requested, code P0665 will be set.

    Decreased engine performance Symptoms

    • Decreased engine performance

    Common Problems That Trigger the P0665 Code

    • Intake manifold tuning valve actuator failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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