What it means
A fault has been detected in battery charger A input voltage sensor B circuit. The code does not specify whether the fault is an open, short, or other circuit problem.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery Charger A uses input voltage sensor B to report a voltage measurement to the charging controls. This code sets when that sensor circuit has a fault, but it does not specify whether the circuit is open, shorted, or affected in another way; charging may be limited or interrupted.
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 charger live data for the input voltage sensor B reading when the fault occurred.
- Check whether the fault occurs with a particular AC supply, charging station, or only after charging begins.
- With charging disconnected and the system made safe according to service information, inspect the Battery Charger A sensor B connector and harness for looseness, damage, moisture, or corrosion.
- Use the manufacturer's wiring diagram to test the sensor B circuit for opens, shorts, and poor terminal contact.
- If the wiring checks pass, test input voltage sensor B and the charger control-module input against the manufacturer's specifications.
Common fixes
- Reseat a loose sensor B connector.
- Repair damaged or corroded wiring and terminals in the sensor B circuit.
- Replace Battery Charger A input voltage sensor B if testing confirms it has failed.
- Repair the charger control-module input if the sensor and wiring pass testing.
Can I keep driving?
Do not rely on charging if the session repeatedly faults or stops; use only equipment and procedures approved for the vehicle. The fault can interrupt charging and may limit available vehicle power.
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.