What it means
The control pilot charging switch A reports a range/performance condition. SAE J1772 charging signal handshake may be compromised.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Control pilot charging switch A provides a switch signal to the charging control system. This code sets when the switch A signal is outside its expected range or performance pattern, which can make the module misread the switch state and disrupt charging control.
Common causes
Most likely first.
- Charging switch A signal outside the expected range
- Damaged switch wiring or poor connector connection
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 charging-status data to see when control pilot charging switch A's range/performance fault occurs.
- With the vehicle made safe according to service information, inspect switch A and its connector for poor seating, corrosion, or damaged terminals.
- Inspect the switch A wiring for damage or a poor connection that could shift its signal.
- Test switch A operation and its signal circuit against the manufacturer's specification.
- If switch A and its wiring pass, check the associated connector and module input for a connection fault.
Common fixes
- Reseat and secure the switch A connector.
- Clean or repair damaged switch A terminals or wiring.
- Replace control pilot charging switch A if its signal remains outside specification.
- Repair a faulty connection at the related module input if testing confirms it.
Can I keep driving?
Charging may fail or be interrupted, and the vehicle may limit operation, so check for reduced-power warnings and make sure the battery has enough range. Avoid a long trip if operation is restricted, and have the switch A circuit checked promptly.
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.