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P3445

BMS Communication Bus Fault

2012-2017 Buick Regal 2.4L I4 Hybrid

Critical SeverityPowertrainGeneric (SAE)

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

  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.

Other Powertrain Codes

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.

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