Loose, corroded or damaged connector at the charger or its current sensor circuit; Chafed, broken or intermittently open or shorted wiring in the sensor signal, reference or ground circuit; Faulty output current sensor inside the charger unit; Internal fault in the charger module or its control electronics; Low or unstable 12 V supply or poor earth affecting the charger or control unit; Outdated control unit software where the manufacturer has issued a known fix for the model.

P0D55

Battery Charger Hybrid/EV Battery Output Current Sensor 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
55: FaultThe specific fault in that area

What it means

P0D55 is a generic powertrain code meaning the control unit has found the signal from the battery charger's output current sensor circuit to be intermittent or erratic. The charger converts mains or high-voltage supply into charge for the hybrid or EV battery, and its output current is monitored. The module saw the sensor signal drop out, jump or behave implausibly compared with what it expected, rather than being steadily out of range.

Symptoms

Warning light on the dashboard, such as a hybrid system, EV system or malfunction indicator
Charging starts then stops, or is interrupted part way through
Slower than normal charging or reduced charge current
Charging fails to start at some charge points but works at others
Reduced power or limited performance mode on some vehicles
Charge state display behaving erratically while plugged in

Possible causes

Loose, corroded or damaged connector at the charger or its current sensor circuitlikely
Chafed, broken or intermittently open or shorted wiring in the sensor signal, reference or ground circuitlikely
Faulty output current sensor inside the charger unitpossible
Internal fault in the charger module or its control electronicspossible
Low or unstable 12 V supply or poor earth affecting the charger or control unitpossible
Outdated control unit software where the manufacturer has issued a known fix for the modelrare

How to diagnose

Read all stored codes and freeze frame data, noting whether the fault appears during charging, driving or both, and check for related charger or battery codes
Check the 12 V battery condition and charging voltage, as low voltage can cause erratic readings in other modules
Visually inspect the charger wiring, connectors and earths for damage, water ingress, corrosion, heat marks or chafing, following the manufacturer's high-voltage safety procedure
Wiggle test the harness and connectors with the system live while watching the current sensor live data for dropouts or spikes
Try charging from a different supply or charge point to rule out external supply problems
Check the manufacturer's wiring diagram and test the sensor circuit for continuity, shorts and correct reference voltage, only after the high-voltage system is isolated by a qualified person
Check for technical service bulletins or software updates for the specific model and charger
Clear the code and retest to see whether it returns, confirming the repair

How to fix

Clean, secure or replace faulty connectors and terminals in the charger circuit
Repair or replace damaged wiring, and restore good earth connections
Replace the charger or its current sensor if testing shows an internal fault, following manufacturer procedure
Correct any low 12 V battery or charging supply problem
Update the control unit software only where an outdated calibration is a known cause for that model

Can I keep driving?

Medium severity

The car can usually be driven, though charging may be unreliable and some vehicles may limit power. Get it checked soon, because the high-voltage components should only be worked on by a suitably trained technician.

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