What it means
The rocker arm actuator B on bank 2 stays in the activated state when commanded off.
At a glance
- Usually lights the check-engine light
How it works
The B rocker arm actuator on bank 2 changes valve-train operation when the module commands it. This code sets when the module commands that actuator off but the bank 2 mechanism remains activated, which can leave the engine operating in the wrong valve-train mode.
Common causes
Most likely first.
- Mechanical lock pin stuck in activated position
- Oil control valve spool stuck open
- 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 check live data to confirm the module commanded the bank 2 B actuator off when the fault occurred.
- Check oil level and condition, and review available oil-pressure data for conditions that could affect actuator release.
- Inspect the bank 2 B actuator connector and wiring for damage, then check that the oil-control valve is not contaminated or stuck open.
- Test the actuator circuit and solenoid against the manufacturer's procedure to distinguish an electrical fault from a mechanical one.
- If electrical checks pass, inspect the bank 2 actuator lock pin and rocker mechanism for binding, carbon, or debris that could hold it on.
Common fixes
- Correct low or unsuitable engine oil if it is contributing to sticking.
- Repair damaged wiring or a poor connection at the bank 2 B actuator.
- Clean or replace a confirmed stuck-open oil-control valve.
- Repair or replace the bank 2 B rocker arm actuator if its lock pin or mechanism remains engaged.
Can I keep driving?
Drive only as needed if the engine remains smooth; the wrong valve-train mode can reduce power and cause rough running. Avoid heavy loads and stop if severe misfiring or a flashing warning light occurs.
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.