What it means
Battery charger B reports a output shorted condition. HV charging operation may be impaired. The on-board charger negotiates voltage, current and safety with the EVSE; a fault interrupts charging or limits it to AC slow-charge despite a DC fast charger being attached.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery charger B routes controlled charging power to the high-voltage battery. The control module detects an unintended short on charger B’s output circuit and sets this code to stop or restrict charging; charger output faults can also interrupt the vehicle’s ability to negotiate charging safely.
Common causes
Most likely first.
- Downstream short circuit
- Internal short in charger output
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Save freeze-frame data and check charger B status and any related high-voltage or charging-system codes before attempting another charge.
- Stop charging and check the EVSE and cable for visible damage; do not reconnect equipment that is damaged or unusually hot.
- Have the high-voltage system made safe according to the manufacturer’s procedure, then inspect accessible charger B output wiring and connectors for damage or shorting.
- Test the downstream output circuit for an unintended short using the manufacturer’s isolation and measurement procedure.
- If downstream wiring is not shorted, test charger B internally to determine whether its output stage has failed.
Common fixes
- Replace a damaged charging cable or EVSE component if it is confirmed to be the cause.
- Repair shorted or damaged downstream charger output wiring or connectors.
- Replace or repair charger B if its internal output stage is shorted.
- Clear the code and verify charging operation only after the short has been repaired and the prescribed safety checks pass.
Can I keep driving?
Do not continue charging while this fault is active; a short can interrupt charging and may create an electrical or heat hazard. If the vehicle shows a high-voltage warning, smells hot, or has visible damage, stop using it and arrange safe assistance.
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.