P0084 Code - Exhaust Valve Control Solenoid Circuit Bank 2

Discussion in 'P - Powetrain Codes' started by fault code, Dec 4, 2017.

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    fault code Administrator Staff Member

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    What Does P0084 Mean?

    P0084 is a generic OBD2 code that is indicating a fault has been found in the exhaust valve control solenoid. The exhaust valve control solenoid is part of the variable valve timing system.

    P0084 code is set when the ECU tries to control the exhaust valve timing on bank 2 and detects a fault. This fault triggers a Check Engine Light to be seen on the dashboard and a failsafe mode to be activated. Variable valve timing is also disabled due to the failsafe.



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    What are the common causes of P0084 ?

    Potential causes of a P0084 trouble code may include:
    • Wire harness poor connection or corroded terminals
    • Faulty control solenoid
    • Short to power
    • Short to ground
    • Faulty ECM

    What are the symptoms of P0084 ?

    Depending on system design, aside from the CEL, you may or may not notice any drivability symptoms. Usually, if the ECM cannot control the VVT, it will simply lock into a base position. The engine will usually run fine, but you may notice rough idle, poor performance, or poor cruising fuel economy, whether because of VVT failure or for the engine running in “limp home” mode.

    How do you troubleshoot P0084 ?

    The valves of each cylinder are kept closed using a pair of arms that replace the conventional engine's roller-type rocker arm. P0084 code one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin.

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