Fault Family System: Body (B-Codes) 8 SAE Codes

HV Power Outlet Converter Circuit

Diagnostic & Technical Explanation

Code B0127 (DC/AC Converter A High Voltage Power Outlet 'A' Circuit/Open) sets when the body module cannot verify correct operation of one of the household-style AC power outlets fed by the vehicle's DC/AC converter (common on EVs and hybrids offering vehicle-to-load power) -- a specific outlet's circuit reads open, or its dedicated control module reports an internal fault. Because each outlet is switched and monitored independently for occupant safety, a fault typically isolates to one outlet's relay/contactor or its control module rather than the converter as a whole. Common causes are a tripped internal breaker from an overloaded outlet, a corroded outlet contact, or a failed control module for that specific circuit.

These 8 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 8 times.

Codes in this family (8)

Code	Definition	Repair coverage
B0127	DC/AC Converter A High Voltage Power Outlet 'A' Circuit/Open	4 ranked fixes
B0128	DC/AC Converter A High Voltage Power Outlet 'B' Circuit/Open	4 ranked fixes
B0129	DC/AC Converter A High Voltage Power Outlet 'C' Circuit/Open	4 ranked fixes
B012A	DC/AC Converter A High Voltage Power Outlet 'D' Circuit/Open	4 ranked fixes
B012B	DC/AC Converter A High Voltage Power Outlet 'E' Circuit/Open	4 ranked fixes
B012C	DC/AC Converter A High Voltage Power Outlet Control Module 'A'	4 ranked fixes
B012D	DC/AC Converter A High Voltage Power Outlet Control Module 'B'	4 ranked fixes
B012E	DC/AC Converter A High Voltage Power Outlet Control Module 'C'	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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