B0127: DC/AC Converter A High Voltage Power Outlet "A" Circuit/Open

Open circuit on the high-voltage power outlet "A" of DC/AC converter A. The outlet supplies 110/230 V AC from the HV battery on EVs/hybrids (vehicle-to-load).

Low severity. Can I keep driving?You can normally keep driving. If it affects the lights or visibility, get it repaired before driving at night or in the rain.

Symptoms

Warning light or symbol related to the affected system
Comfort or safety function impaired

Most likely causes

Outlet wiring open
Pin pushed back out of connector body
Cracked solder joint inside the module or sensor

What to check, in order

Start with the simplest. You can tick off each step.

Check the fuses and relays
Check the continuity of the wire between the component and the control module.
Read the codes with a multi-system scanner
Check the connectors and wiring
Test the component from the scanner if it allows this

Good to know

Repair difficulty: hard

What each character of B0127 means

B: Body
0: Generic code: same on every make
1: Subsystem depends on the code range
27: Specific fault in that system

Frequently asked questions

Can I keep driving with code B0127?

You can normally keep driving. If it affects the lights or visibility, get it repaired before driving at night or in the rain.

What causes code B0127?

The most common causes are: outlet wiring open; pin pushed back out of connector body; cracked solder joint inside the module or sensor.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.