GM Master Technician Job Description

A GM Master Technician is a highly skilled automotive professional who specializes in diagnosing, repairing, and maintaining General Motors (GM) vehicles to GM’s exact standards. This role requires extensive training, certification, and hands-on experience, and is often a career milestone in GM’s Certified Service Technician path.

Role Overview

GM Master Technicians are responsible for:

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  Performing advanced diagnostics and repairs on complex GM vehicles, including engines, transmissions, electrical systems, brakes, steering, and HVAC.

  
  


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  Ensuring repairs meet GM’s quality and safety standards using the latest diagnostic tools and technology.

  
  


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  Maintaining and servicing engine performance, electrical/electronics, and drivetrain systems GM Service Technical College.

  
  


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  Mentoring and training junior technicians to improve shop performance and customer satisfaction.

  
  

Certification & Training

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  Achieved through GM Automotive Service Educational Program (ASEP) or GM Service Technical College (STC) training.

  
  


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  Requires completing Master Technician Certification (MTC) in select mechanical or body areas, often alongside ASE certifications GM Service Technical College.

  
  


• Must maintain 100% Service Technical Standards (STS) annually to retain certification GM Service Technical College.

Key Responsibilities

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  Conduct comprehensive vehicle inspections and identify root causes of complex issues.

  
  


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  Use advanced diagnostic scanners, oscilloscopes, and proprietary GM tools.

  
  


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  Perform quality control checks and ensure compliance with safety and emissions regulations.

  
  


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  Lead repair workflows and assist in shop operations, including foreman duties in some roles.

  
  


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  Stay updated on new GM technologies, including hybrid and electric vehicle systems.

  
  

Skills & Competencies

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  Advanced diagnostics and computer-aided repair techniques.

  
  


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  Expertise in engine performance, diesel engine performance, transmission servicing, and electrical systems.

  
  


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  Proficiency in ECU programming and vehicle software updates.

  
  


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  Strong problem-solving, attention to detail, and communication skills.

  
  


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  Ability to mentor and train other technicians.