What it means
The forced shutdown voltage feedback of battery charger B is low. Safety shutdown line may be compromised.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery charger B’s forced-shutdown feedback circuit reports whether the charger’s safety shutdown path is available. This code sets when the feedback voltage is below the expected level, which may indicate a wiring fault or a problem in the module shutdown circuit.
Common causes
Most likely first.
- Forced shutdown wire fault
- Module shutdown circuit fault
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 for accompanying charger B or high-voltage safety codes.
- With the vehicle off and charging disconnected, inspect accessible forced-shutdown wiring and connectors for a short to ground, corrosion, looseness, or a pushed-back pin.
- Check connector seating and terminal condition at both ends of the circuit using the manufacturer’s safe access procedure.
- Measure the forced-shutdown feedback circuit and its supply or return paths as directed, comparing readings with the manufacturer’s specification.
- Isolate the harness and module circuits using the manufacturer’s procedure to locate whether the low reading comes from wiring or a module fault.
Common fixes
- Reseat a loose connector or terminal in the forced-shutdown circuit.
- Repair a shorted, damaged, or corroded forced-shutdown wire.
- Repair the affected module shutdown circuit if testing confirms it is pulling feedback low.
- Replace a module only after the manufacturer’s diagnostic procedure confirms an internal failure.
Can I keep driving?
Charging may be blocked or interrupted because the shutdown feedback is too low for the system to verify safe operation. Avoid charging until the safety circuit is repaired, and heed any high-voltage warning.
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.