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P3446

BMS Thermal Runaway Detection System Fault

2012-2017 Buick Regal 2.4L I4 Hybrid

Critical SeverityPowertrainGeneric (SAE)

Description

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.

Related Codes

P3206HV Battery Vent System Malfunction

Other Powertrain Codes

P3446 on Other Vehicles

Common Questions

What does code P3446 mean on a 2012-2017 Buick Regal?

P3446 stands for "BMS Thermal Runaway Detection System Fault". The BMS thermal runaway detection and mitigation system has a sensor or circuit fault. This safety system monitors for rapid cell temperature rise.

What are the symptoms of P3446 on a Buick Regal?

Common symptoms of P3446 include: Critical safety system warning, Vehicle may restrict operation, Battery monitoring in degraded mode, Potential safety risk, Service required immediately.

What causes P3446 on a 2012-2017 Buick Regal?

Common causes of P3446 include: Thermal runaway sensor failure, Sensor wiring fault, BMS safety monitor circuit error, Gas detection sensor failure, Pressure vent sensor malfunction.

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