P266B Fault Code

A Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2

• What does that mean?
• Symptoms
• Causes
• Solutions

The P266B fault code indicates an issue with the rocker arm actuator position sensor circuit for Bank 2. This component plays a critical role in managing the variable valve timing system in your vehicle, which optimizes engine performance and efficiency. When the circuit performance falls outside the accepted range, the engine control unit (ECU) triggers this code, signaling that there could be a malfunction or performance issue in the system.

What are the symptoms of the P266B code?

Symptoms of a P266B fault code may consist of:

• Illuminated check engine light.
• Decreased engine performance or rough idling.
• Poor fuel economy due to inefficient valve timing.
• Engine noise or unusual sounds during operation.

What causes the P266B code?

Common causes of the P266B fault code include:

• Faulty rocker arm actuator position sensor.
• Poor electrical connections or corroded wiring in the sensor circuit.
• A malfunctioning engine control unit (ECU).
• Mechanical issues within the rocker arm assembly or associated components.

How to fix P266B?

To resolve the P266B fault code, consider the following steps:

• Inspect the rocker arm actuator position sensor and its wiring for any signs of damage or corrosion.
• Test the sensor for proper functioning; replace it if necessary.
• Check the ECU for any faults and ensure software updates are current.
• Use a scan tool to clear the code and monitor if it returns after performing repairs.