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B0128: DC/AC Converter A High Voltage Power Outlet “B” Circuit/Open

Severity
Low
System
Body Electrical
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does B0128 Mean?

B0128 is a diagnostic trouble code indicating: DC/AC Converter A High Voltage Power Outlet “B” Circuit/Open. This code relates to the body electrical system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of B0128

Common Causes

Frequently Asked Questions

What does B0128 mean?
B0128 indicates: DC/AC Converter A High Voltage Power Outlet “B” Circuit/Open. The vehicle's computer has detected that the DC/AC Converter A High Voltage Power Outlet “B” is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code B0128?
Yes, B0128 is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.
How much does it cost to fix B0128?
Repair costs for B0128 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect and repair DC/AC Converter A High Voltage Power Outlet “B” wiring and connectors
  • 🔧 Replace faulty DC/AC Converter A High Voltage Power Outlet “B”
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

B0120 Fluid Reservoir Level Sensor E B0121 Fluid Reservoir Level Sensor F B0122 Pedestrian Alert Speaker A B0123 Pedestrian Alert Speaker B B0124 Night Vision Camera B0125 Night Vision Control Module B0126 Driver Monitoring Camera B0127 DC/AC Converter A High Voltage Power Outlet “A” Circuit/Open