What it means
The position sensor signal for actuator B on bank 2 is above the upper diagnostic threshold. 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, and its position sensor reports how far that actuator has moved. The control module compares the sensor signal with its allowed range; this code sets when the signal stays above the upper threshold.
Common causes
Most likely first.
- Open sensor element
- Signal wire shorted to the 5 V reference
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light
- Reduced engine power or performance
How to diagnose it
- Use a scan tool to record freeze-frame data and compare the bank 2 actuator B position reading with the commanded position to confirm the high signal.
- Inspect the actuator B sensor connector and bank 2 wiring for water, corrosion, pushed-back pins, or chafing that could affect the signal.
- With the circuit active, gently move the bank 2 harness and watch the live sensor reading for a change that points to a loose or damaged connection.
- Check the sensor signal wire for a short to the 5 V reference and inspect connector contact quality, following the manufacturer's wiring information.
- If wiring and connections are sound, test the actuator B position sensor for an open element and replace it if it fails the manufacturer's checks.
Common fixes
- Seat the bank 2 actuator B sensor connector and repair loose or corroded terminals.
- Repair chafed or water-damaged wiring in the actuator B sensor circuit.
- Replace the open actuator B position sensor if circuit checks confirm it has failed.
Can I keep driving?
You may be able to drive gently if the engine runs normally, but avoid hard acceleration because bank 2 valve operation may be affected. Stop if power drops sharply or the engine runs poorly.
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.