P266B: Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2
The P266B code indicates that the Engine Control Module (ECM) has detected a performance or range issue with the rocker arm actuator position sensor circuit on Bank 2. This sensor monitors the position of the rocker arm actuator, which controls variable valve timing or cylinder deactivation. A fault can cause incorrect valve timing, leading to reduced engine performance, increased emissions, and potential engine damage if not addressed.
01. Most Common Causes
- Faulty rocker arm actuator position sensor
- Wiring or connector issues in the sensor circuit
- Failed rocker arm actuator
- ECM software or hardware problem
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire
- Reduced engine power or hesitation
- Poor 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 wiring and connectors for Bank 2 rocker arm actuator sensor for damage or corrosion.
Step 3: Test the sensor's resistance and voltage according to manufacturer specifications.
Step 4: If sensor and wiring are okay, test the actuator itself for proper operation.
Step 5: If all components pass, check for ECM software updates or replace the ECM.
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 damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary from $150 to $400 depending on the cause, with sensor replacement being on the lower end and actuator or ECM replacement on the higher end.