P0D24
Battery Charger A Temperature Too High.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- D
- AreaReserved
- 24
- FaultThe specific fault in that area
What it means
P0D24 means the control unit monitoring the on-board battery charger (charger A) has seen its temperature rise above the allowed limit. This applies to plug-in hybrids and electric vehicles. The reading may come from the charger's own temperature sensor or from a cooling or power-supply problem. The system usually reduces or stops charging to protect the charger and the high-voltage battery.
Symptoms
- Charging is slow, interrupts or stops part-way through
- Charging will not start, especially after a recent drive or in hot weather
- Warning light for the charging or hybrid/EV system on the dashboard
- Reduced performance or a message about a charging system fault
- Cooling fan or pump running louder or for longer than normal near the charger
Possible causes
- Low coolant level, air in the circuit or poor flow in the charger cooling loop (where the charger is liquid cooled)likely
- Blocked, dirty or failed cooling fan, ducting or airflow path around the charger (where the charger is air cooled)likely
- Failed coolant pump or faulty cooling control valve serving the chargerpossible
- Charger temperature sensor fault or a wiring or connector problem giving a false high readingpossible
- Internal charger fault causing excess heat, such as a failing power stagepossible
- Poor high-voltage or low-voltage connections at the charger causing resistance and heat, or a damaged charging cable or supplyrare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting charger temperature, ambient temperature and whether the car was charging or driving when it set
- Check for related codes covering the charger, cooling system, temperature sensors or high-voltage battery, as these point to the root cause
- Visually inspect the charger area for blocked vents, debris, damaged ducting, coolant leaks and damaged wiring or connectors
- With the correct high-voltage safety precautions, check the coolant level and condition in the charger cooling circuit; the procedure varies by model
- Check that the cooling pump or fan operates when commanded, using a scan tool's actuator tests where available
- Compare live charger temperature data with other temperature readings when the car has cooled to see whether the sensor reading is realistic
- Test the charging supply and cable, and try a different known-good charging point to rule out supply issues
- Check the manufacturer's service information for the charger's sensor, wiring and resistance tests, as these depend on the model
How to fix
- Top up and bleed the charger cooling circuit and repair any coolant leaks, following the manufacturer's procedure
- Clean or clear blocked airflow paths and repair or replace a faulty cooling fan or ducting
- Replace a faulty coolant pump or control valve
- Repair damaged wiring or connectors, or replace a faulty charger temperature sensor if it is serviceable separately
- Replace or repair the charger if it is confirmed faulty, using only a qualified high-voltage technician; a calibration update only applies if the manufacturer lists one for this fault
Can I keep driving?
Medium severity
The car can usually still be driven, but charging may be limited or unavailable, so book a check soon. Stop and seek help if you notice a burning smell, coolant loss, or a red warning for the high-voltage system.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.