What is OBD-II Code P266D – A Rocker Arm Actuator Position Sensor Circuit High Bank 2

A Rocker Arm Actuator Position Sensor Circuit High Bank 2 – What is OBD-II Code P266D?

As a mechanic, I’ve seen countless OBD-II codes pop up on customer’s cars. One OBD-II code that I’ve encountered frequently is P266D. However, what does this code mean? Should you be worried about it, and how do you repair the issue? In this article, we’ll explain what P266D code means and how to diagnose and fix the issue.

What is OBD-II Code P266D?

OBD-II code P266D is a generic diagnostic trouble code that indicates a problem with the rocker arm actuator position sensor circuit in bank 2. If your engine’s powertrain control module (PCM) detects a high circuit input signal, it’ll trigger this code. Bank 2 refers to the set of cylinders where the number two cylinder is located.

The rocker arm actuator position sensor helps in controlling the engine’s variable valve timing (VVT) system. The VVT system alters the camshaft’s position relative to the crankshaft, which optimizes engine performance, efficiency, and emissions.

If this system malfunctions, you may experience issues such as reduced power, drivability, and fuel economy. Moreover, if left unchecked, it can cause additional problems like worn timing chains, damaged valves, misfires, and even engine failure.

Symptoms of P266D Code

The symptoms of P266D can vary depending on the severity of the issue. Here are some of the most common symptoms of code P266D:

1. Check Engine Light (CEL) – The first thing you may notice is the check engine light on your dashboard. The light may illuminate continuously or intermittently.

2. Reduced power – The vehicle may exhibit a lack of power, especially when accelerating or driving uphill.

3. Rattling noise – If the issue is severe, you may hear a loud rattling noise coming from your engine. It’s usually caused by loose or damaged timing chains or rocker arms.

4. Rough idle – The engine may idle roughly, shake, or vibrate. It may also stall, especially when starting the car.

Diagnostic Procedure for P266D Code

Before you attempt to diagnose and repair P266D code, it’s important to have a basic understanding of your vehicle’s engine and its components. Here are the general diagnostic steps that we follow:

1. Check the Freeze Frame Data

When your vehicle’s PCM sets a code, it also records data on what was happening at the time. This data is known as Freeze Frame Data and includes information such as the engine speed, coolant temperature, throttle position, and more. You can access this data using a diagnostic scanner.

2. Inspect the Wiring and Connectors

Next, inspect the wiring and connectors in the rocker arm actuator position sensor circuit. Look for any signs of damage, wear, or corrosion. Make sure that all connectors are clean, tight, and properly secured.

3. Inspect the Rocker Arm Actuator

If the wiring and connectors are OK, inspect the rocker arm actuator and its circuit for any faults. You may need to remove some engine covers to access the actuator. Make sure that the actuator is properly aligned, clean, and not damaged. Also, check if it’s getting the required voltage and ground signal.

4. Check the VVT System

Finally, check the VVT system for malfunctions. The system may include sensors, solenoids, oil passages, and more. Ensure that all components are clean, functional, and well-lubricated. Use a repair manual or technical service bulletin to guide you through the diagnostic process.

How to Fix P266D Code

Once you’ve identified the root cause of the P266D code, it’s time to fix the issue. Here are some general steps that we follow:

1. Repair or replace any damaged wiring, connectors, or components. Use OEM (Original Equipment Manufacturer) parts whenever possible.

2. If the rocker arm actuator is faulty, you may need to replace it. Use a quality replacement part and ensure that it’s correctly aligned and installed.

3. If the VVT system is malfunctioning, repair or replace the faulty components. Follow the manufacturer’s guidelines and use the right tools and techniques.

4. Once you’ve made the necessary repairs, use a diagnostic scanner to clear the code and test drive the vehicle to confirm that the issue has been resolved.

Frequently Asked Questions

Q. What does it mean when the rocker arm actuator position sensor circuit is high?
A. When the PCM detects a high voltage signal in the rocker arm actuator position sensor circuit, it’ll trigger the P266D code. It usually means that the signal is above the typical range, which may indicate a short circuit or open circuit in the circuit.

Q. How much does it cost to repair the P266D code?
A. The cost of repairing the P266D code can vary depending on its severity, location, and the make and model of your vehicle. Generally, the repair costs can range from $100 to $1000 or more, depending on the repairs required.

Q. Can I still drive my car with a P266D code?
A. It’s generally not recommended to drive your vehicle when it has a P266D code. It can cause engine damage, reduced power, and negative effects on drivability and fuel economy. Additionally, the code may indicate more serious underlying issues that require immediate attention.

Q. Can I clear the P266D code myself?
A. Yes, you can clear the P266D code yourself using a diagnostic scanner. However, it’s important to diagnose and repair the underlying issues first; otherwise, the code may return.

Q. How can I prevent the P266D code from happening again?
A. To prevent the P266D code from recurring, it’s essential to follow your vehicle’s maintenance schedule, use quality parts and lubricants, and diagnose and repair any issues promptly. Additionally, avoid harsh driving conditions and misusing your vehicle.


In summary, OBD-II code P266D indicates a problem with the rocker arm actuator position sensor circuit in bank 2. It can cause issues such as reduced power, rough idle, and rattling noise, among others. To diagnose and repair the issue, you need to follow a systematic diagnostic procedure and fix any faults in the wiring, connectors, actuator, or VVT system. As with any OBD-II code, it’s essential to diagnose and repair the issue promptly to avoid further damage to your vehicle.

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