What it means
The forced shutdown voltage feedback of battery charger B is high. 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 lets the control module verify the charger’s safety shutdown path. This code sets when feedback voltage is higher than expected, which can result from a circuit fault or a module shutdown circuit problem and may prevent charging.
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 forced-shutdown, charger B, or high-voltage safety codes.
- With charging stopped, inspect accessible forced-shutdown wiring for a short to power, damaged insulation, corrosion, or connector problems.
- 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 and relevant circuit paths under the prescribed conditions, comparing them with the manufacturer’s specification.
- Isolate the harness and module circuits as directed to identify whether the high feedback comes from wiring or a module shutdown circuit.
Common fixes
- Repair wiring shorted to power or damaged insulation in the forced-shutdown circuit.
- Clean or repair corroded, loose, or damaged connector terminals.
- Repair the module shutdown circuit if testing confirms it is driving feedback high.
- Replace a module only if the manufacturer’s diagnostic procedure confirms an internal fault.
Can I keep driving?
Charging may be refused or interrupted because the module cannot verify the forced-shutdown feedback. 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.