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Our automotive experts have put together the following information about the P3490 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P3490 code.

OBD II Fault Code

  • OBD II P3490

    OBD-II Code Decreased engine performance is defined as a Cylinder 12 Deactivation/Intake Valve Control Circuit Performance

    In an effort to meet fuel and emissions standards, many manufacturers are utilizing cylinder deactivation systems. This system allows the engine's control module (PCM) to disable select cylinders when additional power is not needed from the engine, such as at idle or when cruising on the highway. If the engine's control module (PCM) determines that the Intake Valve for cylinder number twelve is not Turning on or off the way it is being commanded, the PCM will set code P3490.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P3490 Code

    • Engine oil level is too low
    • Powertrain Control Module (PCM) failure
    • Variable valve timing solenoid failure
    • Wiring issue
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