Onboard Charger Output Current Regulation Fault
2012-2017 Buick Regal 2.4L I4 Hybrid
Description
The OBC is unable to maintain stable output current during charging. The charge current fluctuates or cannot reach the target level.
Symptoms
- Charging slower than expected
- Charge current fluctuating
- Extended charge times
- Charging session interruptions
- Battery not reaching full charge
Common Causes
- OBC output stage degradation
- Battery resistance affecting current control
- OBC temperature causing derating
- Output current sensor drift
- Software calibration error
Diagnostic Steps
- Monitor charge current and voltage during session
- Check OBC temperature during charging
- Compare actual vs target charge current
- Test at different charge levels
- Review OBC software version
Repair Notes
Replace OBC if output regulation is out of specification. Software update may address calibration issues.
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
P3402 on Other Vehicles
Common Questions
What does code P3402 mean on a 2012-2017 Buick Regal?
P3402 stands for "Onboard Charger Output Current Regulation Fault". The OBC is unable to maintain stable output current during charging. The charge current fluctuates or cannot reach the target level.
What are the symptoms of P3402 on a Buick Regal?
Common symptoms of P3402 include: Charging slower than expected, Charge current fluctuating, Extended charge times, Charging session interruptions, Battery not reaching full charge.
What causes P3402 on a 2012-2017 Buick Regal?
Common causes of P3402 include: OBC output stage degradation, Battery resistance affecting current control, OBC temperature causing derating, Output current sensor drift, Software calibration error.