BMS Communication Bus Fault
2012-2017 Buick Regal 2.4L I4 Hybrid
Description
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
- Read BMS internal communication status
- Identify which monitoring board is affected
- Check internal bus termination
- Inspect inter-module connectors
- Test communication bus signal quality
Repair Notes
Repair internal BMS communication bus. Replace affected cell monitoring board. Re-seat internal connectors.
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
P3445 on Other Vehicles
Common Questions
What does code P3445 mean on a 2012-2017 Buick Regal?
P3445 stands for "BMS Communication Bus Fault". The BMS internal communication bus connecting cell monitoring boards has a fault, preventing full battery monitoring.
What are the symptoms of P3445 on a Buick Regal?
Common symptoms of P3445 include: Partial battery data unavailable, Power output limited as precaution, Some cell voltages read as zero, BMS warning indicator, Charging may be limited.
What causes P3445 on a 2012-2017 Buick Regal?
Common causes of P3445 include: Internal CAN/SPI bus wiring fault, Cell monitoring board failure, Connector between modules loose, EMI affecting internal communication, BMS main controller port failure.