P0D4D

What it means

P0D4D is a generic code meaning the battery charger's hybrid/EV battery output voltage sensor circuit is reporting a value that is out of range or does not make sense compared with other readings. The charger or hybrid control unit compares this sensor's voltage with expected values, such as the traction battery voltage, and set the code when the two disagree or the reading is implausible. The exact sensor location and strategy depend on the make and model.

Symptoms

• Charging fault warning or hybrid/EV system warning on the dashboard
• Vehicle will not charge from a plug-in source, or charging stops part-way
• Reduced charging rate or charging that starts and then cancels
• Reduced power or limited performance mode on some vehicles
• Charge state display showing odd or fluctuating values

Possible causes

• Wiring or connector fault in the charger output voltage sensor circuit (corrosion, loose pin, chafed wire, water ingress)likely
• Faulty battery charger output voltage sensor or internal charger faultlikely
• Poor high-voltage connection or contact resistance between the charger and the traction battery causing a voltage mismatchpossible
• Low-voltage supply or earth problem to the charger or control unit (weak 12 V battery, poor earth)possible
• Traction battery voltage sensing fault giving a reading that disagrees with the charger sensorpossible
• Outdated or faulty control unit software where the manufacturer has issued a known fixrare

How to diagnose

1. Read all stored and pending codes plus freeze frame data, and note whether other charger, battery or 12 V supply codes are present
2. Check the 12 V battery condition and charging voltage, as low supply voltage can cause false sensor faults
3. Inspect the charger and sensor wiring and connectors for damage, corrosion, moisture and poor pin tension, following the manufacturer's high-voltage safety procedure
4. Check for any technical service bulletins or software updates for the model and code
5. Compare live data for the charger output voltage with the traction battery voltage with the vehicle in a charging state and note any mismatch
6. Check supply and earth circuits to the charger and measure the sensor circuit signal and reference values against manufacturer specifications
7. Only if qualified in high-voltage work, isolate the system as specified and check the high-voltage connections for condition and security
8. Clear the code and retest by attempting a charge cycle to confirm whether the fault returns

How to fix

• Repair or replace damaged wiring, terminals or connectors in the sensor circuit
• Replace the battery charger or its output voltage sensor if confirmed faulty, as the design dictates
• Clean, repair or secure poor high-voltage or low-voltage connections, by a suitably qualified technician
• Restore a healthy 12 V supply by charging or replacing the 12 V battery and repairing any earth fault
• Update the control unit software where the manufacturer lists it as a fix for this fault

Can I keep driving?

Nearby codes

• P0D4CGenericBattery Charger Hybrid/EV Battery Output Voltage Sensor Circuit
• P0D4EGenericBattery Charger Hybrid/EV Battery Output Voltage Sensor Circuit Low