What it means
The forced shutdown voltage feedback of battery charger B is performance. 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 has a forced-shutdown feedback circuit that tells the control module whether its safety shutdown path is behaving as expected. This code means the feedback voltage does not perform as expected, so the module may interrupt charging because it cannot confirm reliable shutdown behavior.
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
- Record freeze-frame data and check for related charger B shutdown, communication, or charging codes.
- With charging stopped, visually inspect the accessible forced-shutdown wiring and connectors for damage, looseness, corrosion, or pin displacement.
- Check connector seating and terminal condition at the charger B and control-module ends using the manufacturer’s safe access procedure.
- Measure forced-shutdown feedback during the prescribed key states and compare it with the manufacturer’s expected behavior.
- Isolate the wiring from the modules as directed to determine whether the feedback fault is in the wire or a module shutdown circuit.
Common fixes
- Reseat a loose forced-shutdown connector or terminal.
- Repair damaged or corroded forced-shutdown wiring.
- Repair the affected module shutdown circuit if testing isolates the fault there.
- Replace a module only if the manufacturer’s diagnostic procedure confirms its shutdown circuit has failed.
Can I keep driving?
Charging may be unavailable or may stop because the safety shutdown path cannot be confirmed. Avoid repeated charging attempts and do not use the vehicle if it displays a high-voltage safety 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.