What Does P265B Mean?
The position sensor for the "B" rocker arm actuator on Bank 1 is providing a signal that is outside expected parameters or does not correlate with commanded actuator position. The sensor may be reading incorrectly or the actuator is not moving properly.
Common Causes
35%
Mechanically stuck or sluggish rocker arm actuator not moving to commanded position
30%
Failing position sensor providing inaccurate readings
20%
Low oil pressure or contaminated oil affecting actuator movement
10%
Intermittent wiring or connector issue causing signal dropout
5%
Timing issue with actuator response due to sludge buildup
Diagnostic Steps
1
Step 1: Monitor position sensor data with scan tool while commanding actuator through full range of motion
2
Step 2: Check engine oil level and condition; verify correct viscosity and change if contaminated
3
Step 3: Compare Bank 1 sensor readings to Bank 2 if equipped; significant differences indicate problem
4
Step 4: Remove actuator and inspect for mechanical binding, wear, or debris
5
Step 5: Test actuator and sensor operation on bench with appropriate power and oil supply if possible
Estimated Repair Cost
$250 - $1,000
Parts + labor, varies by vehicle and location
The position sensor for the "B" rocker arm actuator on Bank 1 is providing a signal that is outside expected parameters or does not correlate with commanded actuator position. The sensor may be reading incorrectly or the actuator is not moving properly.
The most common cause of P265B (B Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 1) is: Mechanically stuck or sluggish rocker arm actuator not moving to commanded position
Typical repair costs for P265B range from $250 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may experience reduced power, rough idle, or increased fuel consumption. Address soon to prevent potential engine damage from incorrect valve timing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P265B to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing/Cylinder Deactivation System
Difficulty
Type
Generic (SAE)
Recommended Tools
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