What it means
The control module detects a control pilot signal frequency below the expected range. Charging behavior depends on the vehicle and charging equipment.
How it works
The control pilot is a signal exchanged between the vehicle and charging equipment to coordinate a charging session. P0E72 indicates that the vehicle detects a pilot signal frequency below its expected range, which can prevent charging from starting or make it stop. The cable, charge inlet wiring, onboard charger, or charging station may be responsible.
Common causes
Most likely first.
- Faulty charging cable or connector
- Poor connection at the charge inlet
- Damaged control pilot wiring
- 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
- Record any charging-related freeze-frame or event data and note whether the fault occurs with a particular cable or charging station.
- Inspect the charging connector and vehicle inlet for dirt, moisture, bent pins, or a loose fit.
- Try a known-good compatible charging cable and station, if available, to determine whether the low-frequency signal follows the equipment.
- Check the control pilot wiring between the inlet and onboard charger for damage or poor connections using the wiring diagram.
- If the cable, station, inlet, and wiring check out, have the onboard charger's pilot input evaluated to the manufacturer's specification.
Common fixes
- Clean and dry the charge inlet and connector, and ensure the plug seats fully.
- Replace a faulty charging cable or connector.
- Repair damaged or poorly connected control pilot wiring.
- Repair or replace the onboard charger or charging equipment if testing isolates the fault there.
Can I keep driving?
Driving is generally possible if the vehicle operates normally, but charging may fail or stop unexpectedly. Keep enough charge for the trip and avoid relying on a charging session until the cause is found.
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.