What it means
The position sensor signal for actuator A 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 A rocker arm position sensor on bank 2 provides feedback as the valve-lift mechanism moves. This code sets when that feedback is intermittent or erratic, often because a loose connector or chafed harness briefly interrupts the signal, especially with engine vibration.
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 A position signal live to see whether it drops out or jumps as the fault occurs.
- Check that the bank 2 A sensor connector is fully seated, then inspect its terminals for looseness, corrosion, or water entry.
- Inspect the harness near the rocker cover for chafing, pinching, or heat damage where vibration could interrupt the signal.
- Wiggle the connector and harness while watching live data to reproduce the dropout and narrow its location.
- If the harness and connector remain stable, check the sensor signal and supply circuits against the manufacturer's specification and test the sensor.
Common fixes
- Reseat and secure the bank 2 A sensor connector, repairing loose or corroded terminals.
- Repair or reroute chafed bank 2 A sensor wiring so it cannot rub against the valve cover.
- Replace the bank 2 A position sensor if its output drops out despite a stable connector and harness.
Can I keep driving?
Performance may come and go as the bank 2 A signal drops out, so avoid fast traffic or hard acceleration if the engine hesitates. Stop driving if the loss of power becomes severe or unpredictable.
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.