P0D81

Code

Generic P — Powertrain

Battery Charger Input Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 40 RU: 30

AI status

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Page language: EN

Causes

Damaged or corroded charger input wiring, connectors, or terminals
Blown fuse or faulty input relay/contactor in the charging circuit
Faulty onboard charger (OBC) or charger control module
Poor ground/earth connection or chassis bonding at charger
Faulty or incompatible charging station / EVSE or poor AC supply
HV battery or DC bus issues (low/high voltage, excessive resistance)

Symptoms

Reduced or no vehicle charging from AC charger
Longer than normal charge times or charge session interruptions
Charge rate reduced or limited during charging
Hybrid/EV warning lamp or charge system warning displayed
Diminished regenerative braking or limited power availability
Stored diagnostic trouble codes related to charger/charging circuit

What to check

Read DTCs and freeze frame/charging-session data with a capable scan tool
Verify charger status, error messages, and live data for input voltage/current/power
Visually inspect charge port, inlet wiring, fuses, relays/ contactors and high-voltage connectors for damage or corrosion
Measure AC supply at inlet (with EVSE) and DC bus/charger input voltages under static and charging conditions
Check ground/earth connection resistance and continuity to chassis
Swap to a known-good EVSE or charging feed to rule out external supply problems

Signal parameters

AC input voltage: vehicle-dependent; typical 110–240 VAC single-phase or 208–240 VAC three-phase (confirm vehicle spec)
DC bus / charger input voltage: vehicle-dependent; typical 200–800 VDC depending on architecture
Charge current: 0–(vehicle max) A; observe expected ramp-up when charging begins
Charger enable/command signal: present and within expected logic levels on command
Charger temperature sensor: within operating range (no over-temperature)
CAN messages: charger status and voltage/current reports present and valid

Diagnostic algorithm

Retrieve active and pending codes plus freeze frame and charging session logs using a manufacturer-capable scan tool.
Confirm the code is current (not stored only). Attempt a key cycle and short charge session to reproduce while monitoring live data.
Visually inspect inlet, cabling, fuses, relays/contactors and high-voltage connectors for damage, corrosion, loose or burned terminals.
With appropriate HV precautions, measure AC input at inlet/EVSE and DC bus voltage at charger input with the charger enabled and disabled. Compare to vehicle specifications.
Check continuity and resistance of charger input wiring and ground/earth straps; ensure bonding to chassis is low resistance.
Verify charger control enable signals and feedback using the scan tool (enable command present when charging is requested, charger reports current/voltage).
Swap to a known-good EVSE or different AC feed to eliminate external supply issues; attempt charge and observe behavior.
Inspect charger module for overheating, coolant issues (if liquid-cooled), or internal damage. If accessible, check internal fuses/contactors per service manual.
Verify CAN/communication integrity: check for proper network voltages, termination, and absence of bus errors. Re-scan after repairs.
If wiring, connectors, fuses and external supply are good but problem persists, consider reinstalling/updating charger firmware per TSBs and, if needed, replacing the onboard charger or associated control module.
Clear codes and perform a confirmatory charge session to ensure the fault does not return.