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Diesel Service Technician and Mechanic Career Profile

Last updated: December 15, 2025 1:07 pm
December 15, 2025
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20 Min Read
Key Takeaways
  • Diesel service technicians and mechanics inspect, repair, and overhaul buses, trucks, and other vehicles with diesel engines.
  • Typically requires a high school diploma or equivalent, with employers increasingly preferring postsecondary training in diesel engine repair.
  • The median annual wage for diesel service technicians and mechanics was $60,640 in May 2024. Employment is projected to grow 3% from 2023 to 2033 (BLS data, 2023).

Picture this: A massive 18-wheeler pulls into a repair shop, its engine sputtering and struggling. A skilled professional approaches, armed with diagnostic tools and years of experience. This is the world of a diesel service technician and mechanic.

Think about the last time you saw a city bus or a large delivery truck on the road. These vehicles, along with many others, rely on diesel engines for their power and efficiency.

A Diesel service technician and mechanic is the unsung heroes who keeps these vital machines running smoothly, ensuring that goods are delivered, passengers are transported, and industries continue to function. They inspect, repair, or overhaul buses and trucks, or maintain and repair any type of diesel engine.

These professionals bring a unique blend of mechanical expertise and technological savvy to their work. They not only understand the intricacies of diesel engines but also stay current with the latest advancements in engine technology and computerized diagnostic equipment. 

Total Employment: 300,200 (2023)

Common Names for Diesel Service Technicians and Mechanics 

  • Diesel Mechanic
  • Diesel Technician
  • Truck Mechanic
  • Bus Mechanic
  • Heavy Vehicle Mechanic
  • Diesel Engine Specialist
  • Fleet Mechanic
  • Heavy Equipment Mechanic
  • General Repair Mechanic
  • Service Technician
  • Trailer Mechanic
  • Transit Mechanic

What Diesel Service Technicians and Mechanics Are

Diesel service technicians and mechanics are responsible for maintaining and repairing diesel engines in a variety of vehicles and equipment. Their core responsibilities include:

  • Diagnostic Testing: Diesel service technicians and mechanics perform comprehensive diagnostic tests on diesel engines and related systems to identify malfunctions and determine necessary repairs, using advanced tools and techniques to pinpoint issues.
  • Repair and Maintenance: They inspect, repair, and overhaul diesel engines, including replacing worn parts, adjusting systems, and conducting routine maintenance to ensure optimal performance and longevity, extending the life of critical equipment.
  • Preventive Maintenance: These technicians conduct regular inspections and perform preventive maintenance tasks such as oil changes, filter replacements, and fluid checks to prevent breakdowns and extend equipment life, minimizing downtime and maintenance costs.
  • Vehicle Systems Expertise: Diesel service technicians and mechanics repair and maintain various vehicle systems, including brakes, transmissions, electrical systems, and steering mechanisms, ensuring overall vehicle functionality and safety.
  • Safety Compliance: They adhere to safety protocols and industry standards while performing repairs and maintenance to ensure workplace safety and regulatory compliance, protecting themselves and others from hazards.
  • Customer Communication: Diesel service technicians interact with customers to understand issues, explain diagnoses, and provide clear information about repairs and maintenance performed, fostering trust and satisfaction.
  • Documentation: These professionals maintain accurate records of repairs, services, and parts used for each job to ensure proper tracking and facilitate future maintenance, supporting efficient service management.
  • Tool and Equipment Proficiency: Diesel service technicians and mechanics utilize and maintain a wide range of diagnostic tools, power tools, and specialized equipment necessary for diesel engine repair and maintenance, staying proficient in the use of complex machinery.
  • Continuous Learning: They stay updated on new technologies, repair techniques, and industry advancements to maintain expertise in evolving diesel engine systems, ensuring they can address complex issues and improve efficiency.

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SOURCES:BLS.govCareerOneStop
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Previous Article Automotive Service Technician and Mechanic Career Profile
Next Article General Maintenance and Repair Worker Career Profile

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