What it means
The position sensor signal for actuator B on bank 2 jumps or drops out intermittently. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
How it works
The B rocker arm actuator on bank 2 changes the valve train's operating mode, while its position sensor tells the control module how the actuator moved. This code sets when the sensor signal jumps or drops out instead of remaining consistent with the actuator's position.
Common causes
Most likely first.
- Sensor connector not fully seated
- Harness chafed against valve cover
- Connector with intermittent contact under vibration
Symptoms
- Check-engine light
- Intermittent loss of engine performance
How to diagnose it
- Record freeze-frame data and monitor the bank 2 actuator B position signal and command on a scan tool to see when the reading becomes erratic.
- Check that the actuator B sensor connector is fully seated and inspect its terminals for corrosion, looseness, or pin push-back.
- Inspect the bank 2 harness where it passes the valve cover for chafing, and gently move the harness while watching live sensor data.
- Check the sensor circuit wiring and connector continuity while flexing the harness to find an intermittent break or contact.
- If the wiring and connector remain stable, test the position sensor and actuator according to the manufacturer's procedure.
Common fixes
- Fully seat and secure the bank 2 actuator B sensor connector.
- Repair chafed wiring where the harness contacts the valve cover.
- Clean or repair terminals with intermittent contact.
- Replace the position sensor if it continues to drop out after circuit faults are ruled out.
Can I keep driving?
If performance is currently normal, drive gently and avoid high-load acceleration; intermittent actuator feedback can cause sudden loss of power. Stop if the engine runs roughly or power loss makes driving unsafe.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.