P3402high severityPowertrain
Onboard Charger Output Current Regulation Fault
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
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.
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