P0D40

What it means

P0D40 is a generic powertrain code meaning the control unit has detected a circuit high fault on the input voltage sensor (sensor A) for battery charger A. This relates to the onboard charger on a plug-in hybrid or electric vehicle. The control unit saw the sensor signal sit above its expected range, which suggests a wiring fault, a sensor fault or an implausible reading.

Symptoms

• Warning light on the dashboard, such as a hybrid or EV system fault lamp
• Vehicle will not charge, or charging stops shortly after it starts
• Reduced charging speed or charging interrupted intermittently
• Charge port indicator showing a fault or flashing an error pattern
• Reduced electric range because the battery has not charged fully

Possible causes

• Open circuit, short to voltage or high resistance in the wiring or connector for the charger input voltage sensorlikely
• Faulty input voltage sensor or sensing circuit inside the onboard chargerlikely
• Corroded, damaged or loose connector terminals at the charger or its control modulepossible
• Unstable or out-of-range supply voltage from the charging point or home supplypossible
• Faulty charger control module or internal fault in the charger unitpossible
• Outdated control unit software that mis-reads the sensor, where the manufacturer has issued a fixrare

How to diagnose

1. Read all stored codes and freeze frame data, noting whether charging was in progress and any other charger or high-voltage codes
2. Check for manufacturer service bulletins and software updates for the specific model, as the circuit and procedure vary by vehicle
3. Try charging from a different, known-good supply or charging point to rule out a supply voltage problem
4. Inspect the charge port, charger connectors and wiring for damage, water ingress, corrosion or chafing, following the manufacturer's high-voltage safety procedure
5. Check live data for the charger input voltage reading and compare it with the actual supply voltage
6. Test the sensor circuit for short to voltage, open circuit and reference voltage using the wiring diagram for the vehicle
7. Clear the code and recharge to see if it returns, which helps separate a permanent fault from an intermittent one

How to fix

• Repair or replace damaged wiring and connectors in the sensor circuit
• Clean or replace corroded terminals and reseat connectors securely
• Replace the onboard charger or its sensor if the circuit tests good and the fault is internal
• Replace or repair the charger control module if confirmed faulty
• Apply any available manufacturer software update if the fault is a known calibration issue
• Have any high-voltage component work carried out by a technician trained for hybrid and EV systems

Can I keep driving?

Nearby codes

• P0D3FGenericBattery Charger A Input Voltage Sensor A Circuit Low
• P0D41GenericBattery Charger A Input Voltage Sensor A Circuit Intermittent/Erratic