Mains supply or charge point delivering voltage above the vehicle's accepted range; Faulty or poorly set up charge point or supply equipment, including a wrongly set local supply; Fault in the on-board charger voltage sensing, giving a false high reading; Damaged, corroded or loose wiring or connectors between the charge inlet and charger; Charge inlet or charge cable fault upsetting the supply signal; Outdated or faulty charger control software, where the manufacturer has identified it as a known cause; Internal failure of the on-board charger unit.

P0D28

Battery Charger Input Voltage Too High.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
D: AreaReserved
28: FaultThe specific fault in that area

What it means

P0D28 is a generic code meaning the control unit for the battery charger (the on-board charger in a plug-in hybrid or electric vehicle) has measured an input voltage above its permitted limit. The input is normally the mains supply from the charge point, although the exact monitoring point depends on the model. The charger usually stops or limits charging when this is set.

Symptoms

Charging will not start or stops part-way through
Charge port or dashboard warning light, or a charging fault message
Charging works at some charge points but not others
Charge time much longer than normal
Hybrid or EV system warning lamp on
Charge status indicator flashes an error pattern

Possible causes

Mains supply or charge point delivering voltage above the vehicle's accepted rangelikely
Faulty or poorly set up charge point or supply equipment, including a wrongly set local supplylikely
Fault in the on-board charger voltage sensing, giving a false high readingpossible
Damaged, corroded or loose wiring or connectors between the charge inlet and chargerpossible
Charge inlet or charge cable fault upsetting the supply signalpossible
Outdated or faulty charger control software, where the manufacturer has identified it as a known causerare
Internal failure of the on-board charger unitrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting any other charger, high voltage battery or communication codes
Ask when it happens and whether it occurs at home, public points or both
Try a different charge point and cable, ideally a known good one, and note whether the fault follows the car or the supply
Have the supply voltage at the charge point checked by a qualified electrician against the vehicle's stated input range
Visually inspect the charge inlet, pins, seals and the accessible wiring and connectors for water, heat damage, corrosion or looseness
Check live data for the charger input voltage reading and compare it with the measured supply voltage
Check for manufacturer service bulletins and software updates relevant to the model and charger
Any test on high voltage components must be done only by technicians trained in high voltage safety, following the manufacturer's procedure

How to fix

Have the supply or charge point corrected or replaced if its voltage is out of range
Replace a faulty charge cable or charge point equipment
Repair or replace damaged wiring, connectors or terminals, and dry and clean any contaminated connections
Replace a faulty charge inlet assembly
Update the charger control software if an outdated version is a known cause for that model
Replace the on-board charger if testing confirms an internal fault or faulty voltage sensing

Can I keep driving?

Low severity

The car can normally be driven as usual, as this fault mainly affects charging. If a hybrid or EV system warning appears with other faults, or the car has reduced power, have it checked promptly, and avoid charging from a supply you suspect is faulty.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.