BMS High-Voltage Bus Pre-Charge Timeout
2012-2017 Buick Regal 2.4L I4 Hybrid
Description
The BMS pre-charge sequence timed out before the HV bus voltage reached the target level.
Symptoms
- Vehicle will not enter Ready mode
- HV system fails to energize
- Clicking sounds from relay area
- Extended start-up attempt then failure
- No drive available
Common Causes
- Pre-charge resistor degraded
- HV bus capacitor leaking charge
- Contactor coil weak
- Excessive load on HV bus during pre-charge
- Pre-charge relay contact resistance high
Diagnostic Steps
- Monitor HV bus voltage during pre-charge attempt
- Test pre-charge resistor value
- Check HV bus capacitor leakage
- Measure contactor coil current
- Isolate sections of HV bus to find excessive load
Repair Notes
Replace pre-charge resistor or relay. If HV bus capacitor is faulty, inverter replacement may be needed.
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
P3444 on Other Vehicles
Common Questions
What does code P3444 mean on a 2012-2017 Buick Regal?
P3444 stands for "BMS High-Voltage Bus Pre-Charge Timeout". The BMS pre-charge sequence timed out before the HV bus voltage reached the target level.
What are the symptoms of P3444 on a Buick Regal?
Common symptoms of P3444 include: Vehicle will not enter Ready mode, HV system fails to energize, Clicking sounds from relay area, Extended start-up attempt then failure, No drive available.
What causes P3444 on a 2012-2017 Buick Regal?
Common causes of P3444 include: Pre-charge resistor degraded, HV bus capacitor leaking charge, Contactor coil weak, Excessive load on HV bus during pre-charge, Pre-charge relay contact resistance high.