P266D: Rocker Arm Actuator Position Sensor Circuit High Bank 2
The P266D code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the rocker arm actuator position sensor on Bank 2. This sensor monitors the position of the rocker arm actuator, which controls variable valve timing or cylinder deactivation. A high circuit condition typically means the signal voltage is above the expected range, often due to a short to power, a faulty sensor, or wiring issues. This can lead to improper actuator operation, affecting engine performance and fuel economy.
1. Most Common Causes
- Faulty or misadjusted bank 2 rocker arm actuator position sensor
- Sensor wiring shorted to reference voltage (VREF) or battery voltage
- Corroded, damaged, or bent pins in the sensor connector
- Bank 2 rocker arm actuator mechanically stuck or excessively worn
- Internal ECM/PCM failure (less common)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance
- Poor fuel economy
- Rough idle or misfire
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the sensor and wiring for damage or corrosion.
Step 3: Test sensor signal voltage with a multimeter; compare to specifications.
Step 4: Check for shorts to power or ground in the circuit.
Step 5: Replace sensor if faulty; clear codes and test drive.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and potential engine damage. Immediate diagnosis is advised.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for sensor replacement, plus diagnostic fees if performed by a shop.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.