B012C: DC/AC Converter A High Voltage Power Outlet Control Module A

What it means

Fault reported by control module "A" of the high-voltage power outlet on DC/AC converter A.

At a glance

• Usually lights the airbag (SRS) or body-system warning light

How it works

DC/AC converter A provides AC power through its high-voltage outlets, with control module A managing or reporting outlet operation. B012C indicates that module A has reported a fault or is not passing the system’s checks; the code alone does not identify whether the cause is the module, its supply, wiring, or communication.

Common causes

Most likely first.

1. Internal failure of outlet control module A
2. Open or shorted module wiring
3. Loose or corroded connector
4. Power or ground supply fault
5. Communication fault with the module

Symptoms

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

How to diagnose it

1. Save freeze-frame data and scan for converter communication, power-supply, and outlet codes that could point to a shared cause.
2. Inspect the wiring and connector serving outlet control module A for damage, loose fit, moisture, or corrosion.
3. Check module A’s power and ground circuits against the wiring diagram and manufacturer’s specification.
4. Check the module communication circuit and connector terminals for opens, shorts, or poor contact using the vehicle’s service information.
5. If power, ground, wiring, and communication are sound, use the manufacturer’s diagnostic procedure to confirm whether outlet control module A has failed.

Common fixes

• Clean and secure a loose or corroded module A connector, repairing damaged terminals as needed.
• Repair an open or short in module A’s wiring.
• Restore the module A power or ground supply, including a failed fuse if the underlying cause is corrected.
• Repair a communication-circuit fault between module A and the converter or vehicle network.
• Replace outlet control module A only after tests confirm an internal failure.

Can I keep driving?

Avoid relying on the affected high-voltage outlet until the fault is diagnosed. If there are no other electrical-system warnings, normal driving may be possible, but do not open or probe high-voltage equipment.