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Code B012B

Symptoms

• Power outlet not working

• Warning light on the dashboard

• Inability to use electrical devices plugged into the outlet

Common Causes

• Faulty DC/AC converter

• Damaged wiring or connectors

• Blown fuse in the power outlet circuit

Glossary

DC: Direct Current

AC: Alternating Current

Converter: A device that changes electrical energy from one form to another

Related Codes

• B012A

• B012C

Laymans terms

This code means there's a problem with the car's power outlet system. It's like when a plug in your house doesn't work because the wire is broken or not connected.

Explanation

The code indicates an issue with the circuit related to the DC/AC converter's high voltage power outlet, specifically outlet 'E'. This could mean the circuit is open or not functioning correctly.

Technical description

The B012B code is set when the vehicle's control module detects an open circuit or malfunction in the high voltage power outlet 'E' of the DC/AC converter. This converter is responsible for converting direct current (DC) from the vehicle's battery to alternating current (AC) for use in various electrical components.

Diagnosis steps

• Check the fuse related to the power outlet circuit.

• Inspect wiring and connectors for damage or disconnection.

• Test the DC/AC converter for proper operation.

Repair procedures

• Replace the blown fuse.

• Repair or replace damaged wiring or connectors.

• Replace the faulty DC/AC converter.

Tools required

• Multimeter

• Screwdriver set

• Wire repair kit

Estimated repair cost

$100 - $300

Difficulty level

Moderate

Commonly affected vehicles

• Toyota Prius

• Chevrolet Volt

• Nissan Leaf

Preventive measures

• Regularly inspect wiring for damage.

• Avoid overloading power outlets.

• Ensure proper use of electrical devices.

Error code type

Electrical Circuit Issue

User experience recommendations

• Avoid using the affected power outlet until repaired.

• Consult a professional mechanic for diagnosis.

• Check vehicle warranty for coverage.

Warranty information

Repairs may be covered under the vehicle's electrical system warranty. Check with the manufacturer or dealer.

Historical data

This code has been associated with vehicles using advanced electrical systems, particularly hybrids and electric vehicles, due to their reliance on DC/AC converters.

Urgency level

Moderate – While the vehicle can still be driven, electrical components relying on the outlet may not function.

Legal and safety notice

Ensure all repairs are conducted by a qualified professional to avoid electrical hazards.

Testing conditions

• Vehicle ignition in the ON position.

• Power outlet in use or tested with a compatible device.

Component location

The DC/AC converter is typically located near the vehicle's battery or electrical distribution center.

FAQs

Q: Can I still drive my car with this code?
A: Yes, but the affected power outlet may not work, so avoid using it until repaired.

Q: Is this a common issue?
A: It's more common in vehicles with advanced electrical systems, such as hybrids and electric cars.

Last updated: Jun 9, 2026 • Source: internal database
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