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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
P3446critical severityPowertrain

BMS Thermal Runaway Detection System Fault

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

What this code means

The BMS thermal runaway detection and mitigation system has a sensor or circuit fault. This safety system monitors for rapid cell temperature rise.

Symptoms

  • Critical safety system warning
  • Vehicle may restrict operation
  • Battery monitoring in degraded mode
  • Potential safety risk
  • Service required immediately

Common causes

  • Thermal runaway sensor failure
  • Sensor wiring fault
  • BMS safety monitor circuit error
  • Gas detection sensor failure
  • Pressure vent sensor malfunction

Diagnostic steps

  1. Check thermal runaway sensor status in BMS
  2. Test individual detection sensors
  3. Inspect sensor wiring connections
  4. Verify BMS safety monitor self-test results
  5. Check gas detection sensor calibration

Repair notes

SAFETY CRITICAL. Repair immediately. Replace thermal runaway detection sensors. This system protects against catastrophic battery failure.

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