P0CF6: Control Pilot Circuit High

What it means

The control pilot signal (SAE J1772 / IEC 61851 charging) reports a circuit high condition. EV charging handshake compromised.

At a glance

• Usually lights the check-engine light

How it works

The control pilot is the communication signal used to establish a charging session between an EV and its charging equipment. This code sets when the pilot circuit signal is too high, which can result from a short to voltage, an open, or a faulty circuit component and can prevent a valid handshake.

Common causes

Most likely first.

1. Control pilot signal circuit shorted to voltage
2. Open or faulty control pilot circuit component

Symptoms

• Charge status indicator shows fault
• Charging may not start or interrupts
• Slower-than-expected charge rate

How to diagnose it

1. Review scan-tool and charge-status data and check whether the high pilot fault occurs with one charging unit or different units.
2. Fully disconnect and reconnect the charging cable, confirming that the plug and vehicle inlet are seated and latched.
3. Inspect the plug and charge inlet for damaged contacts, moisture, debris, or a loose connection.
4. With charging equipment disconnected and the vehicle made safe, inspect accessible pilot wiring for an open circuit or contact with a powered wire.
5. Test the pilot signal, wiring, and related components against the manufacturer's specification to distinguish a wiring fault from a failed component.

Common fixes

• Reseat the charging cable and correct a loose inlet connection.
• Repair an open pilot wire or a signal wire shorted to voltage.
• Repair or replace damaged inlet or cable terminals.
• Replace a faulty pilot-circuit component confirmed by testing.

Can I keep driving?

The fault usually affects charging, so check that the vehicle has enough range before driving and expect charging to fail or stop. Avoid using a damaged cable or inlet until the pilot circuit has been checked.