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Navy NEC · Engineering

B12A Advanced Diagnostics Technician

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

A Navy Enlisted Classification: a skill designation sailors hold in addition to their rating.

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Overview

An Advanced Diagnostics Technician troubleshoots and diagnoses electrical systems, electrical controls, and fuel systems. This technician also diagnoses emission controls, powertrain systems, and hydraulic and pneumatic systems.

Core Skills

  • Electrical system and control troubleshooting
  • Fuel and emission control diagnostics
  • Hydraulic and pneumatic system diagnostics
  • Advanced troubleshooting of powertrain systems

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Bus and Truck Mechanics and Diesel Engine Specialists

Your military troubleshooting of fuel, emission control, electrical, and powertrain systems transfers to diagnosing truck and diesel equipment malfunctions.

How to prepare: Take hands-on training in diesel diagnostic test procedures and Cummins INSITE to practice applying your troubleshooting experience to civilian engines.

What the civilian work involves
  • Attach test instruments to equipment, and read dials and gauges to diagnose malfunctions.
Civilian tools and software (examples)
  • Cummins INSITE

Mobile Heavy Equipment Mechanics, Except Engines

Your military diagnosis of hydraulic, pneumatic, electrical, and powertrain systems provides directly relevant troubleshooting experience for heavy equipment defects.

How to prepare: Complete hands-on service training for a heavy equipment platform, focusing on manufacturer diagnostic procedures and post-repair performance testing.

What the civilian work involves
  • Operate and inspect machines or heavy equipment to diagnose defects.
  • Test mechanical products and equipment after repair or assembly to ensure proper performance and compliance with manufacturers' specifications.

Automotive Service Technicians and Mechanics

Your military electrical control, fuel, emission control, and powertrain diagnostics overlap with automotive component and system testing.

How to prepare: Take a hands-on automotive diagnostics course that uses computerized diagnostic devices and manufacturer performance specifications.

What the civilian work involves
  • Test drive vehicles and test components and systems, using equipment such as infrared engine analyzers, compression gauges, and computerized diagnostic devices.
  • Test and adjust repaired systems to meet manufacturers' performance specifications.

Notes & Sources

Evidence for this guidance (4 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC B12A

    [1] NEC entry "B12A - Advanced Diagnostics Technician"; cached text line 2200; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: Electrical system and control troubleshooting, Fuel and emission control diagnostics, Hydraulic and pneumatic system diagnostics, Advanced troubleshooting of powertrain systems, Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00), Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00), Automotive Service Technicians and Mechanics (O*NET 49-3023.00)

  2. O*NET: Bus and Truck Mechanics and Diesel Engine Specialists

    [2] O*NET 30.3 occupational data

    Supports: Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00)

  3. O*NET: Mobile Heavy Equipment Mechanics, Except Engines

    [3] O*NET 30.3 occupational data

    Supports: Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00)

  4. O*NET: Automotive Service Technicians and Mechanics

    [4] O*NET 30.3 occupational data

    Supports: Automotive Service Technicians and Mechanics (O*NET 49-3023.00)

Defense contractor jobs for B12A

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

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