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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
P3445critical severityPowertrain

BMS Communication Bus Fault

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

What this code means

The BMS internal communication bus connecting cell monitoring boards has a fault, preventing full battery monitoring.

Symptoms

  • Partial battery data unavailable
  • Power output limited as precaution
  • Some cell voltages read as zero
  • BMS warning indicator
  • Charging may be limited

Common causes

  • Internal CAN/SPI bus wiring fault
  • Cell monitoring board failure
  • Connector between modules loose
  • EMI affecting internal communication
  • BMS main controller port failure

Diagnostic steps

  1. Read BMS internal communication status
  2. Identify which monitoring board is affected
  3. Check internal bus termination
  4. Inspect inter-module connectors
  5. Test communication bus signal quality

Repair notes

Repair internal BMS communication bus. Replace affected cell monitoring board. Re-seat internal connectors.

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