AutoCodes – Generic – P266B

P266B Code - 'A' Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2

Quick Answer

The Engine Control Module (ECM) commands the Rocker Arm Actuator to control the oil hydraulic circuit. Common causes include Low or overfilled engine oil, Incorrect engine oil type, Faulty 'A' Rocker Arm Actuator Sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P266B indicates 'A' Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2.
Common causes: Common causes include Low or overfilled engine oil, Incorrect engine oil type, Faulty 'A' Rocker Arm Actuator Sensor.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,437

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P266B Description

The Engine Control Module (ECM) commands the Rocker Arm Actuator to control the oil hydraulic circuit. Oil flows through the Rocker Arm Actuator to the variable valve timing system to adjust the engine's valve timing. The variable valve timing (VVT) system is used to improve engine's performance, fuel economy or emissions. The ECM monitors the 'A' Rocker Arm Actuator Position Sensor and sets the OBDII when the 'A' Rocker Arm Actuator Position Sensor signal is out of factory specifications.

OBDII Code P266B - 'A' Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2 - AutoCodes.com — P266B Code - 'A' Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2

What does this mean?

What are the Possible Causes of the DTC P266B?

Low or overfilled engine oil
Incorrect engine oil type
Faulty 'A' Rocker Arm Actuator Sensor
'A' Rocker Arm Actuator Sensor harness is open or shorted
'A' Rocker Arm Actuator Sensor circuit poor electrical connection

How to Fix the DTC P266B?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P266B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.