Onboard Charger Communication Error with BMS
2012-2017 Buick Regal 2.4L I4 Hybrid
Description
The onboard charger has lost communication with the battery management system. The BMS provides charge voltage and current limits to the OBC.
Symptoms
- Charging stops unexpectedly
- No charge session initiated
- Communication fault displayed
- BMS and OBC codes present simultaneously
- Intermittent charging
Common Causes
- CAN bus wiring fault between OBC and BMS
- OBC communication module failure
- BMS communication module failure
- CAN bus termination issue
- Software incompatibility after update
Diagnostic Steps
- Check CAN bus communication between OBC and BMS
- Inspect CAN wiring for damage
- Test CAN bus termination resistance
- Check for BMS communication codes
- Verify software versions of OBC and BMS
Repair Notes
Repair CAN bus wiring. Replace OBC or BMS communication module if faulty.
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
P3403 on Other Vehicles
Common Questions
What does code P3403 mean on a 2012-2017 Buick Regal?
P3403 stands for "Onboard Charger Communication Error with BMS". The onboard charger has lost communication with the battery management system. The BMS provides charge voltage and current limits to the OBC.
What are the symptoms of P3403 on a Buick Regal?
Common symptoms of P3403 include: Charging stops unexpectedly, No charge session initiated, Communication fault displayed, BMS and OBC codes present simultaneously, Intermittent charging.
What causes P3403 on a 2012-2017 Buick Regal?
Common causes of P3403 include: CAN bus wiring fault between OBC and BMS, OBC communication module failure, BMS communication module failure, CAN bus termination issue, Software incompatibility after update.