What Does P265A Mean?
The PCM has detected a problem with the position sensor circuit for the "B" rocker arm actuator on Bank 1. This sensor monitors the actual position of the actuator to verify it is responding to commands.
Common Causes
35%
Failed rocker arm actuator position sensor or internal sensor fault
30%
Damaged or corroded sensor connector or wiring
20%
Open or short in position sensor signal circuit
10%
Poor ground connection for position sensor
5%
PCM fault in sensor input circuit
Diagnostic Steps
1
Step 1: Inspect sensor connector for corrosion, moisture, or damaged terminals
2
Step 2: Measure voltage at sensor reference and ground pins; typically 5V reference and solid ground
3
Step 3: Check sensor signal voltage with key on; should vary between 0.5-4.5V depending on position
4
Step 4: Inspect wiring harness for damage, especially near engine mounts and moving components
5
Step 5: Test sensor resistance if accessible; compare to manufacturer specifications
Estimated Repair Cost
$250 - $900
Parts + labor, varies by vehicle and location
The PCM has detected a problem with the position sensor circuit for the "B" rocker arm actuator on Bank 1. This sensor monitors the actual position of the actuator to verify it is responding to commands.
The most common cause of P265A (B Rocker Arm Actuator Position Sensor Circuit Bank 1) is: Failed rocker arm actuator position sensor or internal sensor fault
Typical repair costs for P265A range from $250 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but engine performance will be reduced. The PCM cannot verify actuator position and may disable variable valve timing features.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P265A 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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