P0E73: Control Pilot Signal High Frequency

What it means

The control module detects a control pilot signal frequency above the expected range. Charging behavior depends on the vehicle and charging equipment.

How it works

The control pilot signal lets the vehicle and charging equipment coordinate a charging session. P0E73 indicates that the detected pilot frequency is above its expected range, so the vehicle may reject the signal or interrupt charging. A faulty cable or station, inlet connection, pilot wiring, or onboard charger can cause the high-frequency reading.

Common causes

Most likely first.

1. Faulty charging cable or connector
2. Poor connection at the charge inlet
3. Damaged control pilot wiring
4. Fault in the onboard charger or charge station

Symptoms

• Charging may fail to start
• Charging may stop unexpectedly
• Charging indicator or EV warning light

How to diagnose it

1. Save charging event data and note whether the fault occurs only with one cable or charging station.
2. Inspect the vehicle charge inlet and plug for moisture, damaged pins, contamination, or a connection that does not seat securely.
3. Try a known-good compatible cable and station, if available, to see whether the high-frequency fault follows the charging equipment.
4. Inspect and test the control pilot wiring between the inlet and onboard charger for damage or poor connections.
5. If external equipment and wiring pass, check the onboard charger's pilot input against the manufacturer's specification.

Common fixes

• Clean and dry the inlet and connector, then ensure the plug is fully seated.
• Replace a cable or connector that produces the fault during testing.
• Repair damaged or loose control pilot wiring.
• Repair or replace the onboard charger or charging station when testing identifies it as the source.

Can I keep driving?

The fault usually affects charging rather than driving, provided the vehicle otherwise operates normally. Do not count on a charging session completing until the cause is identified.