What it means
The position sensor that confirms the B rocker arm switching state on bank 1 returns no usable signal.
At a glance
- Usually lights the check-engine light
How it works
The B rocker arm actuator position sensor reports whether the switching mechanism has reached the commanded position on bank 1. The controller sets this code when the sensor circuit provides no usable signal, so it cannot confirm the B actuator's position.
Common causes
Most likely first.
- Open sensor element
- Corroded sensor connector
Symptoms
- Check-engine light
- Reduced engine power or acceleration
- Rough running or engine misfire
How to diagnose it
- Record freeze-frame data and review live position data for the bank 1 B actuator to confirm the signal is missing.
- Inspect the B position-sensor connector on bank 1 for looseness, corrosion, moisture, or damaged pins.
- Check the sensor wiring for breaks or damage and verify connector continuity using the manufacturer's procedure.
- Test the B position sensor output and supply circuits against the manufacturer's specification.
- If wiring and supplies are sound but the signal remains unusable, test the sensor and module input as directed by the manufacturer.
Common fixes
- Reconnect or clean the bank 1 B position-sensor connector.
- Repair broken or damaged sensor wiring.
- Replace the B position sensor if it does not produce a usable signal.
- Repair the module-side connection if testing locates the fault there.
Can I keep driving?
Use caution and avoid hard acceleration if the engine has reduced power or runs roughly, because the controller cannot verify bank 1 actuator B's position. Stop if severe misfiring develops or the check-engine 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.