What it means
The position sensor signal for actuator A on bank 2 is below the lower 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 sends a signal that lets the module track the valve-lift mechanism. This code sets when that signal falls below the module's lower threshold, often because the signal is shorted to ground, the sensor is internally shorted, or a connector has poor contact.
Common causes
Most likely first.
- Internal short in sensor element
- Signal wire shorted to ground
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light
- Reduced engine power or performance
How to diagnose it
- Record freeze-frame data and watch the bank 2 A sensor signal live to confirm it remains below range while the fault is present.
- Inspect the bank 2 A sensor connector for water, corrosion, pushed-back pins, and damaged seals, then check the harness for chafing or contact with ground.
- With the circuit powered as specified, check the sensor supply and ground, and measure the signal at the connector against the manufacturer's specification.
- Wiggle the bank 2 A harness and connector while monitoring the signal to find a short or contact fault that changes with movement.
- If the wiring remains sound, test the sensor itself for an internal short using the manufacturer's procedure.
Common fixes
- Clean and secure corroded bank 2 A sensor connector terminals, replacing terminals or seals that cannot make reliable contact.
- Repair signal wiring shorted to ground or chafed through near the bank 2 rocker cover.
- Replace the bank 2 A position sensor if its signal remains low with a sound supply, ground, and harness.
Can I keep driving?
Reduced power or performance may make the vehicle harder to control in traffic, especially during acceleration. Keep trips short and gentle, and stop if the engine begins running roughly or loses substantial power.
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.