What it means
The control pilot charging switch A reports a intermittent/erratic 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 contributes to the signal the vehicle uses to establish and maintain a charging handshake. This code means the module sees that signal behaving inconsistently over time, often because the switch connector or wiring makes and breaks contact.
Common causes
Most likely first.
- Loose or damaged charging switch A connector
- Damaged wiring causing an intermittent connection
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Save freeze-frame data and look for charging live data showing switch A changing state unexpectedly or at the time charging stops.
- Inspect switch A’s connector for looseness, corrosion, moisture, or pins that move when the connector is handled.
- Examine the harness along its route for chafing, stretching, or damage that could cause an intermittent connection.
- If supported by the manufacturer’s procedure, monitor switch A live data while gently moving the connector and harness to see whether the reading drops out.
- Test switch operation and circuit continuity while flexing the harness, then compare results with the manufacturer’s specification.
Common fixes
- Reseat and secure a loose switch A connector.
- Clean corroded connector pins or replace a damaged connector.
- Repair wiring with an intermittent open or poor connection.
- Replace switch A if its output remains erratic with sound wiring and connections.
Can I keep driving?
The vehicle may be drivable, but charging can start and stop without warning, so do not count on a full charge before a trip. Arrange another reliable charging option until the intermittent fault is repaired.
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.