BMS Thermal Runaway Detection System Fault
2012-2017 Buick Regal 2.4L I4 Hybrid
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
- Check thermal runaway sensor status in BMS
- Test individual detection sensors
- Inspect sensor wiring connections
- Verify BMS safety monitor self-test results
- 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
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
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.