What it means
The ECM detects a intermittent/erratic fault on the battery charger a coupler lock position sensor circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The battery charger A coupler lock position sensor changes its signal as the connector lock moves. This code sets when the signal is intermittent or erratic, often because the connector is not fully seated, the ground reference is unstable, or vibration disrupts contact.
Common causes
Most likely first.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Record freeze-frame data and monitor the live lock-position status while slowly operating the charger A coupler lock according to the vehicle's instructions.
- Check that the lock-position sensor connector is fully seated, then inspect its pins and harness for looseness, corrosion, or damage.
- Check the sensor ground reference and related connections for instability using the vehicle's service information.
- If safe and permitted by the vehicle's procedures, gently move the accessible low-voltage harness while monitoring the signal to find intermittent contact loss.
- Compare sensor output and circuit continuity with the manufacturer's specification, then check the module input if the signal remains erratic.
Common fixes
- Reseat and secure the charger A lock-position sensor connector.
- Clean corroded terminals and repair loose pins.
- Repair an unstable ground reference or damaged wiring.
- Replace the sensor if its signal remains erratic with stable connections.
Can I keep driving?
Charging may cut out if the lock signal drops intermittently, so verify the charger A coupler stays locked during a session. Stop using a coupler or lock mechanism that is loose or damaged.
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.