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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
P3400critical severityPowertrain

Onboard Charger (OBC) Internal Fault

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

What this code means

The onboard charger has detected an internal fault that prevents AC charging. The OBC converts AC power from the charging inlet to DC for the battery.

Symptoms

  • Vehicle will not charge from AC source
  • Charging indicator shows fault
  • Reduced charging speed
  • Charge session terminates unexpectedly
  • Error message on dashboard
  • Charging light flashing red

Common causes

  • OBC power electronics failure
  • Internal relay failure
  • PFC circuit malfunction
  • Output rectifier failure
  • Control board fault

Diagnostic steps

  1. Attempt charge session and read OBC fault codes
  2. Monitor OBC input and output voltage during charge
  3. Check OBC coolant temperature
  4. Inspect OBC connectors
  5. Test charging with different EVSE equipment

Repair notes

Replace onboard charger assembly. Verify charging operation with Level 1 and Level 2 EVSE after replacement.

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