What it means
The ECM detects a circuit fault on the battery charger b coupler lock position sensor circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
How it works
The battery charger B coupler lock position sensor reports whether the charging coupler lock is in the expected position. The control module monitors the sensor circuit for a usable signal, and this code sets when that circuit has an electrical fault that makes the reading unreliable.
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
- Review freeze-frame data and charging-system codes to see whether the sensor fault occurred while the coupler was being connected or charging was starting.
- Inspect the charger B coupler lock sensor connector and visible wiring for looseness, damage, or contamination.
- Check that the coupler lock moves freely and that the sensor is not obstructed or visibly displaced.
- Use scan-tool live data to compare the reported lock position with the actual position as the coupler is safely operated.
- Test the sensor circuit and sensor response to the manufacturer's specification to distinguish a wiring fault from a failed sensor.
Common fixes
- Reconnect a loose sensor connector.
- Repair damaged wiring or connector terminals at the coupler lock sensor.
- Clear debris or obstruction preventing the lock from moving freely.
- Replace the faulty coupler lock position sensor.
Can I keep driving?
Charging may fail to start or may stop if the vehicle cannot verify that charger B's coupler is locked. Do not force the coupler or defeat the lock; stop charging if the connection does not secure normally.
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.