What Does P265C Mean?
The PCM has detected abnormally low voltage in the position sensor circuit for the "B" rocker arm actuator on Bank 1. This indicates a short to ground, open reference circuit, or failed sensor.
Common Causes
35%
Shorted to ground signal wire or damaged harness insulation
30%
Failed position sensor with internal short circuit
20%
Corroded or damaged sensor connector causing short or poor connection
10%
Open or damaged 5V reference wire to sensor
5%
PCM internal fault in sensor input circuit
Diagnostic Steps
1
Step 1: Disconnect position sensor connector and measure voltage on 5V reference pin; should read approximately 5V
2
Step 2: Check sensor ground circuit for continuity to chassis ground; should be less than 1 ohm
3
Step 3: Measure resistance of sensor signal wire to ground with sensor disconnected; should be infinite (no short)
4
Step 4: Test position sensor with multimeter if accessible; check resistance and signal output per specifications
5
Step 5: Inspect wiring harness for pinched, chafed, or damaged areas, particularly near engine mounts
Estimated Repair Cost
$200 - $850
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage in the position sensor circuit for the "B" rocker arm actuator on Bank 1. This indicates a short to ground, open reference circuit, or failed sensor.
The most common cause of P265C (B Rocker Arm Actuator Position Sensor Circuit Low Bank 1) is: Shorted to ground signal wire or damaged harness insulation
Typical repair costs for P265C range from $200 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but will operate in a reduced performance mode. Engine may run rough or have limited power until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P265C 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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