P0D82
Battery Charger Input Circuit Low.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- D
- AreaReserved
- 82
- FaultThe specific fault in that area
What it means
P0D82 means the control unit that manages the on-board battery charger has detected the charger input circuit voltage or signal below the expected range. This is seen when the vehicle is plugged in to charge or is preparing to charge. The exact circuit monitored (AC supply side, charger input sensor or control signal) depends on the vehicle design.
Symptoms
- Vehicle will not charge or stops charging part-way through
- Charging warning light or message on the dashboard
- Charge port indicator light flashing or showing a fault
- Reduced electric range because the high-voltage battery is not topping up
- Malfunction indicator lamp on, or a hybrid or EV system warning
- Charging works at some charge points but not others
Possible causes
- Poor or low AC supply from the charge point, cable or domestic socket (voltage drop, tripped protection, faulty supply equipment)likely
- Damaged, corroded or loose connections at the charge inlet, charging cable plug or charger input connectorlikely
- Wiring fault between the charge inlet and the on-board charger (open circuit, high resistance, chafed or water-damaged harness)possible
- Low 12 V auxiliary battery voltage or poor earths affecting the charger control unitpossible
- Fault in the on-board charger or its input voltage sensing circuitpossible
- Charge inlet or control pilot/proximity signal fault, or interference from a faulty inlet componentrare
- Outdated control unit software where the manufacturer has issued a known fix for this faultrare
How to diagnose
- Read all stored codes and freeze frame data, noting whether the fault set during charging, and the supply voltage and battery state at the time
- Try a different charge point and charging cable, and test the supply at the socket or charge point to rule out a supply fault
- Visually inspect the charge inlet and cable plug for damage, water ingress, burnt marks, corrosion, bent pins or debris
- Check the 12 V auxiliary battery condition and charging, and inspect the main earth connections
- Inspect the charger wiring and connectors for chafing, corrosion or loose terminals, only after the high-voltage system has been isolated by a suitably trained technician
- Using a scan tool, monitor live charger input voltage, current and charge status during a charge attempt and compare with the supply voltage
- Check for related codes covering the charger, charge inlet, high-voltage battery or communication faults, and follow the manufacturer's test procedure for the model
- Check for any manufacturer software updates or technical bulletins relevant to the charger for this model
How to fix
- Replace or repair a faulty charging cable or supply equipment, or move to a known good supply
- Clean, repair or replace a damaged charge inlet or its connector terminals
- Repair or replace damaged wiring or connectors between the inlet and the charger
- Recharge or replace a weak 12 V auxiliary battery and correct any poor earth connections
- Replace the on-board charger only once testing confirms it is faulty, following the manufacturer's procedure
- Update the control unit software if an outdated version is a confirmed cause for the model
Can I keep driving?
Medium severity
The vehicle can usually still be driven, but on a pure electric model range will be limited if it cannot charge, and hybrids may rely more on the engine. High-voltage components must only be worked on by suitably trained technicians, so book a diagnosis soon.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.