What it means
The control module monitors whether the B rocker arm actuator system on bank 2 responds as commanded. It sets this code when the system fails to switch from its off state when requested.
At a glance
- Usually lights the check-engine light
How it works
The B rocker arm actuator on bank 2 changes valve-train operation using an electrically commanded, oil-assisted mechanism. This code sets when the module requests activation but the bank 2 system remains in its off state, indicating that the commanded change did not occur.
Common causes
Most likely first.
- Low oil pressure cannot move the actuator
- Mechanical lock pin stuck in unactivated position
- Carbon or debris buildup preventing free movement
Symptoms
- Check-engine light
- Reduced engine power or acceleration
- Rough running or engine misfire
How to diagnose it
- Record freeze-frame data and use live data to confirm the module commanded the bank 2 B actuator on when the fault occurred.
- Check engine oil level and condition, and review oil-pressure information because insufficient pressure can prevent the actuator from moving.
- Inspect the bank 2 B actuator connector, wiring, and oil-control valve area for damage or contamination.
- Test the actuator control circuit and solenoid operation according to the manufacturer's procedure to rule out an electrical fault.
- If circuit operation is correct, inspect the bank 2 actuator's lock pin and moving parts for sticking, carbon, or debris.
Common fixes
- Correct low oil level and use oil that meets the vehicle manufacturer's requirements.
- Repair a loose connector or damaged wiring to the bank 2 B actuator.
- Clean or replace a sticking oil-control valve if testing identifies it as the cause.
- Free or replace the bank 2 B rocker arm actuator if its lock pin or mechanism is stuck off.
Can I keep driving?
If the engine runs smoothly, limit driving to necessary short trips because reduced power and rough running may worsen under load. Stop if it misfires severely, loses power suddenly, or the warning light flashes.
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.