What it means
The ECM detects a circuit 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 tells the control module whether the charging connector is properly locked. This circuit fault sets when the module cannot use the sensor signal reliably to confirm the lock position, which can prevent charging from starting or continuing.
Common causes
Most likely first.
- Sensor failed
- Wiring or connector fault
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 check live lock-position status while inserting and locking the charger coupler, following the vehicle's operating instructions.
- Inspect the charger A coupler lock mechanism and sensor for damage, obstruction, or a loose sensor mounting.
- Check the lock-position sensor connector and harness for poor seating, corrosion, or visible damage.
- Test the sensor circuit and sensor output against the manufacturer's specification while confirming that the lock mechanism changes the reading.
- If the sensor and wiring pass, use the vehicle's diagnostic information to check the control-module input.
Common fixes
- Remove debris or obstruction from the coupler lock mechanism.
- Secure a displaced lock-position sensor and reseat its connector.
- Repair damaged wiring or corroded connector terminals.
- Replace the lock-position sensor if it fails its circuit test.
Can I keep driving?
Charging may not start or may interrupt if the vehicle cannot confirm that the charger A coupler is locked. Do not force the connector or drive away with a cable attached; stop using a damaged or loose coupler.
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.