What is OBD-II Code P2659 – A Rocker Arm Actuator Control Circuit High Bank 2

What is OBD-II Code P2659 – A Rocker Arm Actuator Control Circuit High Bank 2

As a mechanic, a common issue that I have come across is OBD-II Code P2659 – A Rocker Arm Actuator Control Circuit High Bank 2. This issue typically affects engines with Variable Valve Timing (VVT), which is a system that adjusts valve timing to optimize engine performance and fuel efficiency. In this article, I will give a detailed explanation of what this code means and how to repair the issue.

Understanding OBD-II Code P2659

OBD-II codes, or On-Board Diagnostics II codes, are codes that alert you to a problem with your car. The specific code P2659 refers to a problem with the rocker arm actuator control circuit on bank 2. The rocker arm is an important component of the engine that helps move the valves in sync with the engine’s pistons. The rocker arm actuator controls the movement of the rocker arm, which in turn controls the movement of the valves. The actuator control circuit sends signals to the engine control module (ECM) about how much oil pressure is needed for the rocker arm to properly function. When this circuit detects high voltage, it triggers the P2659 code.

Common Symptoms of P2659

When P2659 is triggered, it can cause several issues. The most common symptoms that you may experience include:

1. Illuminated Check Engine Light:
One of the most common symptoms of this code is an illuminated check engine light. The light will signal that there is an issue with the engine, and upon running a diagnostic test, the code will be displayed.

2. Loss of Engine Performance:
Since the rocker arm is an important component in the engine’s performance, you may notice a decrease in performance when this code is triggered. The engine may misfire, stall, or have difficulty accelerating.

3. Rough Idling:
You may also notice shaking, vibrating, or rattling in the engine when idling.

How to Diagnose P2659

To diagnose this issue, the first step is to use an OBD-II scanner to retrieve the code P2659. Once the code is retrieved, further tests are required to determine the root cause of the problem. The following steps can be taken to identify the cause of the problem:

1. Check the Wiring and Connectors:
Check all connections for any loose wiring or damaged connectors. Check the rocker arm actuator control circuit wiring harness for wear, disconnection, corrosion, or damage.

2. Inspect the Rocker Arm:
Examine the rocker arm for any damage or wear and tear. If there are any problems, replace it with a new one.

3. Test the Actuator:
The actuator can be tested by using a multimeter. Measure the voltage coming from the circuit, which should be between 4.5 to 6.5 volts. If the voltage is high, then replace the actuator. If it is within the correct range, then it is not the problem.

4. Inspect the Oil Pressure:
Check the oil pressure readings to determine if they are within normal range. If the pressure readings are too low, then the oil pressure switch or oil pump may be the issue.

How to Repair P2659

Once the root cause of the problem has been identified, the repair work can start. Here are the steps to follow:

1. Replace the Damaged Components:
If there is any wear, tear, or damage to the rocker arm or wiring, replace with new components.

2. Replace the Actuator:
If the actuator is determined to be the issue, it must be replaced with a new one.

3. Check the Oil Pressure:
If the oil pressure is low, check the oil pressure switch or replace the oil pump.

4. Clear the Code:
After the repair work is done, clear the code using an OBD-II scanner. This will reset the check engine light and ensure the issue has been resolved.

Frequently Asked Questions:

1. Can I still drive my car with the P2659 code activated?
You can still drive the car with the code, but it is not recommended as it can cause problems that can lead to engine failure.

2. How much should I expect to pay for repairs?
The cost of repairs will depend on the root cause of the problem. The pricing can range anywhere from $50 to $1000 depending on the severity of the issue.

3. What causes the P2659 code to activate?
The P2659 code can be caused by several factors such as faulty wiring, damaged or worn rocker arm, or a malfunctioning actuator.

4. How can I prevent the P2659 code from occurring again?
Regular servicing and maintenance of the engine can help prevent the P2659 code from activating. Replacing engine components like the oil filter and oil pump will also help.

5. Can I fix the P2659 code myself or do I need to take it to a mechanic?
If you have the necessary technical skills, tools, and know-how, you can fix the P2659 code yourself. However, if you are unsure about anything, it is best to leave it to a professional mechanic.


The P2659 code is something that car owners need to pay attention to in order to prevent engine failure. If you experience any of the symptoms or notice the check engine light is on, it is crucial to get the engine looked at by a mechanic. With the right diagnosis and repairs, you can get the car back to optimal performance and prevent the code from activating again in the future.

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