Damaged, corroded or contaminated charge inlet pins or connector; Loose or poor connection at the onboard charger or high-voltage charging harness plug; Damaged or chafed wiring in the charger input or signal circuit; Faulty or worn charging cable or supply equipment giving an unstable supply; Intermittent fault inside the onboard charger or its control module; Outdated control unit software where the manufacturer has issued a fix for charger input faults.

P0D84

Battery Charger Input Circuit Intermittent/Erratic.

Generic
Powertrain
Generic code
Medium severity

How this code is built

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

What it means

P0D84 is the generic code for an intermittent or erratic signal in the battery charger input circuit, found on plug-in hybrid and electric vehicles with an onboard charger. The control unit saw the charger input voltage, current or status signal drop out, jump or give implausible readings while the car was plugged in or charging. The exact signal monitored and the unit that sets the code depend on the model.

Symptoms

Charging starts and stops repeatedly or fails to complete
Charging interrupted or refused at some charge points but not others
Charging warning light or message on the dashboard
Reduced or no charging current, giving slow charging
Charge port indicator light flashing or behaving oddly
Hybrid or EV system warning light on

Possible causes

Damaged, corroded or contaminated charge inlet pins or connectorlikely
Loose or poor connection at the onboard charger or high-voltage charging harness pluglikely
Damaged or chafed wiring in the charger input or signal circuitpossible
Faulty or worn charging cable or supply equipment giving an unstable supplypossible
Intermittent fault inside the onboard charger or its control modulepossible
Outdated control unit software where the manufacturer has issued a fix for charger input faultsrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including when and under what charging conditions the fault was set
Ask when the fault occurs: at home, at public chargers, in wet weather or only with a certain cable
Try a different charging cable and charge point to rule out external equipment
Inspect the charge inlet for damaged, burnt, corroded or wet pins and check the latch and any temperature or pilot signal components
Inspect the charger harness and connectors for chafing, water ingress, heat marks or loose terminals, following the manufacturer's high-voltage safety procedure
Wiggle test the wiring and connectors while monitoring live charger input data to see if the signal drops out
Check the low-voltage battery condition and supply and ground to the charger, as a weak supply can cause erratic readings
Check for software updates or technical bulletins for the model, and follow the manufacturer's charger test procedure

How to fix

Clean or replace a damaged or corroded charge inlet
Repair or replace damaged wiring and reseat or replace faulty connectors, using a qualified high-voltage technician where needed
Replace a faulty charging cable or avoid the faulty charge point
Repair the low-voltage battery or its connections if it is causing unstable supply
Replace the onboard charger or its control module if testing proves an internal fault
Update the control unit software where an update is available for this fault

Can I keep driving?

Medium severity

The car can usually still be driven, but charging may be unreliable, so range or electric driving may be limited. Have it checked soon, and stop charging if you notice heat, burning smells or damage at the charge port.

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