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2025 FORD F-150
3.5L V6 PowerBoost Hybrid•4WD•AUTOMATIC•hybrid•turbo
12 active safety recalls on this vehicle — view recalls
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Repairs0Labor505Torque148Fluid10DTC1896Battery1Maintenance0Recalls12
P3404high severityPowertrain

Onboard Charger Ground Fault Detected

on 2025 Ford F-150 3.5L V6 PowerBoost Hybrid · 4WD

What this code means

The onboard charger has detected a ground fault condition during charging, which triggers an immediate charge session stop for safety.

Symptoms

  • Charging stops immediately
  • Ground fault indicator on EVSE
  • Charge session will not restart
  • Intermittent charge interruptions
  • Works at some locations but not others

Common causes

  • Ground fault in vehicle wiring
  • EVSE ground fault sensitivity
  • Moisture in charge port
  • Vehicle HV insulation degradation
  • Home wiring ground issue

Diagnostic steps

  1. Test at multiple EVSE locations
  2. Inspect charge port for moisture
  3. Check vehicle HV isolation resistance
  4. Test home electrical outlet grounding
  5. Read OBC ground fault trip data

Repair notes

Dry charge port if moisture is present. Test HV system isolation. Have electrician verify home outlet grounding. Replace OBC if vehicle-side ground fault confirmed.

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