What it means
The position sensor signal for actuator A 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 A rocker arm position sensor on bank 2 reports the valve-lift mechanism's position to the control module. This code sets when the signal rises above the module's upper threshold, which can result from an open sensor circuit or a signal wire shorted to the 5 V reference.
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
- Record freeze-frame data and check live bank 2 A sensor data to verify that the signal is high or fixed above its expected range.
- Inspect the bank 2 A sensor connector for corrosion, backed-out pins, loose fit, or water intrusion, and examine the harness for damage.
- Check the sensor signal wire for a short to the 5 V reference and test sensor supply and ground against the manufacturer's specification.
- Wiggle the bank 2 A harness while monitoring the signal to see whether an intermittent open or short changes the reading.
- If the circuit tests correctly, test the sensor for an internal open using the manufacturer's diagnostic procedure.
Common fixes
- Repair a signal wire shorted to the 5 V reference in the bank 2 A sensor harness.
- Restore a loose or corroded connector contact, replacing damaged terminals or seals.
- Replace the bank 2 A position sensor if it has an internal open and the wiring is intact.
Can I keep driving?
The engine may have reduced power because the module cannot trust the bank 2 A position reading. Drive gently and avoid high-load acceleration until the circuit fault is repaired.
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.