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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
P3403high severityPowertrain

Onboard Charger Communication Error with BMS

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

What this code means

The onboard charger has lost communication with the battery management system. The BMS provides charge voltage and current limits to the OBC.

Symptoms

  • Charging stops unexpectedly
  • No charge session initiated
  • Communication fault displayed
  • BMS and OBC codes present simultaneously
  • Intermittent charging

Common causes

  • CAN bus wiring fault between OBC and BMS
  • OBC communication module failure
  • BMS communication module failure
  • CAN bus termination issue
  • Software incompatibility after update

Diagnostic steps

  1. Check CAN bus communication between OBC and BMS
  2. Inspect CAN wiring for damage
  3. Test CAN bus termination resistance
  4. Check for BMS communication codes
  5. Verify software versions of OBC and BMS

Repair notes

Repair CAN bus wiring. Replace OBC or BMS communication module if faulty.

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