P0D39

What it means

P0D39 means the on-board battery charger control module saw the signal from the charger A input current sensor was implausible or out of its expected range. The sensor circuit is not necessarily open or shorted; the reading simply did not make sense against what the charger was doing, for example showing current when none should flow, or not matching the expected charging current. It applies to plug-in hybrid and electric vehicles that charge from an external supply.

Symptoms

• Warning light on, such as a hybrid system, EV system or charging fault message
• Vehicle will not charge, or charging stops early or fails to start
• Charging is slower than normal or the current is limited
• Charging works from some supplies or charge points but not others
• Intermittent charging faults that come and go
• Reduced electric range because the battery is not fully charged

Possible causes

• Faulty input current sensor or fault inside the on-board charger assemblylikely
• Damaged, corroded or loose wiring or connectors in the current sensor circuitlikely
• Unstable or poor-quality supply from the charge point, cable or household socket affecting the readingspossible
• Damaged charge inlet, charging cable or high-voltage connection causing abnormal current flowpossible
• Low or unstable 12 V supply or poor earth to the charger control modulepossible
• Fault in the charger control module or its software, depending on modelrare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting any other charger, battery or communication codes that may point to the same fault.
2. Ask how the car was being charged when the fault set, and try a different charge point and cable to rule out a supply problem.
3. Inspect the charge inlet, charging cable and connectors for damage, moisture, heat marks or corrosion.
4. Check the 12 V battery condition and charging voltage, and the earth connections to the charger, as low voltage can cause false sensor faults.
5. Inspect the wiring and connectors between the charger and its control module for chafing, pin damage, water ingress or loose terminals.
6. Using live data, compare the charger input current reading with the expected value when the car is idle and when it is charging, and note whether it is stuck, noisy or implausible.
7. Check for manufacturer service information or bulletins for your model, as the sensor test and charger procedures vary by vehicle.
8. Only if you are trained and qualified for high-voltage work, follow the manufacturer's isolation procedure before testing the charger or its supply side.

How to fix

• Repair or replace damaged wiring, connectors or terminals in the current sensor circuit.
• Replace a damaged charge inlet or charging cable.
• Restore a good 12 V supply by charging or replacing a weak battery and repairing poor earths.
• Replace the on-board charger or its current sensor if testing shows it is faulty, following the manufacturer's procedure.
• Clear the code after repair and complete a full charge cycle to confirm the fault does not return.

Can I keep driving?

Nearby codes

• P0D38GenericBattery Charger A Input Current Sensor Circuit
• P0D3AGenericBattery Charger A Input Current Sensor Circuit Low