What it means
The battery charger A input voltage sensor B signal is outside the expected range or does not behave as expected. The code does not establish that the reading is unusable for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery Charger A input voltage sensor B provides a voltage reading used by the charging controls. This code sets when its signal is outside the expected range or behaves implausibly, even if the reading is not completely absent; the charger may reduce or interrupt charging.
Common causes
Most likely first.
- Sensor characteristic drifted
- Sensor mounting displaced
- Sensor element aged beyond calibration window
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Review freeze-frame and live data for input voltage sensor B, including whether the reading changes plausibly when charging starts.
- Check whether the fault is tied to a particular charging supply or appears across different approved charging equipment.
- With charging disconnected and the system made safe according to service information, inspect the sensor B connector and wiring for poor contact, corrosion, or physical damage.
- Compare the sensor B signal with the measured charger input using the manufacturer's testing procedure and specifications.
- If the wiring is sound, test sensor B for drift and verify the charger control-module input.
Common fixes
- Clean or repair a poor sensor B connector connection.
- Repair damaged wiring in the Battery Charger A sensor B circuit.
- Replace input voltage sensor B if its signal is outside the manufacturer's expected response.
- Repair the charger control-module input if the sensor and circuit test correctly.
Can I keep driving?
Avoid repeated charging attempts if the fault keeps interrupting sessions, and use approved charging equipment. Continued incorrect input voltage readings can limit charging or prevent a session from completing.
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.