B Rocker Arm Actuator Position Sensor Circuit Low Bank 1
The P265C code indicates that the powertrain control module (PCM) has detected a low voltage signal from the rocker arm actuator position sensor on Bank 1, side B. This sensor monitors the position of the rocker arm actuator, which controls variable valve timing or cylinder deactivation. A low circuit condition typically means the signal voltage is below the expected range, often due to a short to ground, faulty sensor, or wiring issues. This can affect engine performance, fuel economy, and emissions.
1. Most Common Causes
- Faulty rocker arm actuator position sensor
- Short to ground in the sensor circuit
- Damaged wiring or connector
- Corrosion or poor electrical connection
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire
- Reduced engine power or performance
- Poor fuel economy
- Engine stalling
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the wiring and connector for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and ground circuits with a multimeter; compare to manufacturer specs.
Step 4: If circuits are okay, replace the rocker arm actuator position sensor.
Step 5: Clear the code and test drive to verify repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine performance issues and potential damage. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.