What it means
The charging system control module has detected a low voltage signal in the control pilot charging ventilation switch circuit. It sets the code when the monitored circuit voltage falls below its calibrated threshold.
How it works
The control pilot charging ventilation switch signals whether the required charging ventilation condition is present. This code sets when the charging control module sees the circuit signal below its calibrated threshold, which can prevent or interrupt charging.
Common causes
Most likely first.
- Faulty ventilation switch
- Short to ground in the circuit
- Damaged or pinched wiring
- Loose or corroded connector
- Charging control module fault
Symptoms
- Charging system warning
- Vehicle may not charge
- Charging may stop unexpectedly
- Warning message on the instrument panel
How to diagnose it
- Record freeze-frame data and review charging live data for the ventilation switch signal and charging state when the low condition occurred.
- Inspect the ventilation switch connector and wiring for pinched insulation, a wire shorted to ground, loose terminals, or corrosion.
- Check whether the ventilation switch changes state in live data when operated according to the manufacturer’s procedure.
- With the system safely isolated as specified by the manufacturer, test the circuit for a short to ground and check switch operation.
- Verify connector pin fit and circuit readings against the manufacturer’s specification before considering a charging control module fault.
Common fixes
- Clean and secure a loose or corroded ventilation switch connector.
- Repair wiring shorted to ground or damaged by pinching.
- Replace the ventilation switch if it fails its specified operation test.
- Repair or replace the charging control module only after the switch and circuit pass testing.
Can I keep driving?
The vehicle is generally drivable, but charging may fail or stop unexpectedly. Do not bypass the ventilation signal, and use a reliable charging alternative until the fault is fixed.
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.