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P0084 is a diagnostic trouble code (DTC) for "Exhaust Valve Control Solenoid Circuit (Bank 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
P0084 is a general code indicating an issue with the exhaust valve control circuit on the bank 2 side of the engine.
This code is similar to P0085 and P0086. The engine also has a bank 1 exhaust control solenoid.
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.
A multitude of issues can cause P0084, here are the most common:
Symptoms are generally mild with P0084, after the Check Engine Light is triggered it should be not be a problem to drive to a safe location.
A Check Engine Light being illuminated on the dashboard will be the first noticed symptom.
Once the Check Engine Light has been triggered the car will go into a failsafe mode to prevent damage.
With this trouble code, poor vehicle acceleration and lack of power may be noticed. In addition, you may notice poor gas milage.
A qualified mechanic will begin by hooking up a scan tool to observe any OBD2 codes that are present. These trouble codes will have freeze frame data that lets us know under what conditions such as engine load, RPM, speed, and driving time the fault was detected at.
The codes will then be cleared and a road test is performed under similar conditions to the freeze frame data. If P0084 reappears during the test drive further diagnosis will be needed.
A technician will now perform a visual inspection of the wiring harness and electrical connections.
Next, the scan tool will be used to observe solenoid operation to ensure it is operating properly.
If the solenoid is within specifications, the ECU will need to be tested. Each manufacturer and model has its own testing procedures to follow for the ECU test.
The most common mistake during diagnosis of P0084 is replacing the solenoid before any other testing has been performed.
Although the solenoid is the most common cause of P0084 all steps must be followed and not skipped to accurately fix the vehicle.
P0084 is a common code that is seen with vehicles as they age. Vehicle operation may be hindered by the lack of power, worse acceleration and fuel economy will suffer. These issues should be fixed as soon as possible for safe driving and normal vehicle operation.
Bank 2 should be on the passenger side of the engine. The exhaust valve control solenoid should be found near the exhaust manifold.
Scan tools with the capability to view live data and graph information changes over time will be needed to properly diagnose P0084. This is especially true when the issue is intermittant and tough to detect without a scan tool.
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