What Does P266B Mean?
The rocker arm actuator position sensor signal on Bank 2 is reading outside expected parameters or not responding properly to commanded actuator movement. The sensor circuit is functional but the signal indicates improper mechanical operation or sensor drift.
Common Causes
35%
Mechanical failure of rocker arm actuator preventing proper movement
25%
Low oil pressure preventing actuator engagement
20%
Clogged oil passages to rocker arm actuator
15%
Degraded rocker arm position sensor providing incorrect readings
5%
Failed oil control solenoid for cylinder deactivation system
Diagnostic Steps
1
Step 1: Check engine oil level and condition; verify proper oil viscosity for variable valve system
2
Step 2: Monitor rocker arm position sensor data with scan tool during actuator activation commands
3
Step 3: Check oil pressure to rocker arm actuator system using mechanical gauge if available
4
Step 4: Remove valve cover and manually inspect rocker arm actuator for free movement and locking pin operation
5
Step 5: Test oil control solenoid operation and check for clogged screens or passages
Estimated Repair Cost
$300 - $1,500
Parts + labor, varies by vehicle and location
The rocker arm actuator position sensor signal on Bank 2 is reading outside expected parameters or not responding properly to commanded actuator movement. The sensor circuit is functional but the signal indicates improper mechanical operation or sensor drift.
The most common cause of P266B (A Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2) is: Mechanical failure of rocker arm actuator preventing proper movement
Typical repair costs for P266B range from $300 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine performance will be reduced and fuel economy degraded. Safe to drive but may experience roughness or vibration when cylinder deactivation attempts to engage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P266B to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing / Cylinder Deactivation
Difficulty
Type
Generic (SAE)
Recommended Tools
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