P266D - Rocker Arm Actuator Position Sensor Circuit High Bank 2
The P266D code indicates that the Engine Control Module (ECM) has detected a voltage signal from the rocker arm actuator position sensor on Bank 2 that is higher than the expected range. This sensor monitors the position of the rocker arm actuator, which controls variable valve timing or cylinder deactivation. A high circuit condition typically points to a short to voltage, a faulty sensor, or wiring issues. This can lead to improper valve operation, reduced engine performance, and potential internal engine damage if not addressed.
01. Most Common Causes
- Faulty rocker arm actuator position sensor
- Short to voltage in the sensor circuit wiring
- Damaged connector or corroded pins
- ECM internal fault (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire
- Reduced engine power or poor acceleration
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor voltage and ground circuits with a multimeter; compare to manufacturer specs.
Step 4: If wiring is intact, replace the rocker arm actuator position sensor on Bank 2.
04. Commonly Affected Makes
05. 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 internal 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 vehicle make and model.