How to Become a Diesel Technician

Want to become a diesel technician? It usually takes 1-2 years through a trade school, apprenticeship, or on-the-job training. This guide breaks down every step-from certifications and tools to salary expectations and career paths.

If you like engines, diagnostics, and solving mechanical problems-you're in the right place.

Diesel techs keep the world moving. From trucks and buses to generators and heavy equipment, diesel technicians are critical to supply chains, agriculture, transportation, and construction.

What Do Diesel Technicians Do?

Diesel mechanics inspect, diagnose, and repair diesel-powered systems and engines. That includes:

• Servicing semi-trucks, buses, construction equipment, and tractors
• Rebuilding diesel engines and transmissions
• Diagnosing issues using digital tools and manual inspection
• Maintaining fuel injection, braking, and cooling systems

"Diesel technicians are the hidden force behind every working machine. If it runs on diesel, a tech keeps it alive." - Brad Fishbein, Skilled Trades Educator

How to Become a Diesel Technician (5 Steps)

Here's how to get started as a diesel mechanic:

1. Finish high school or earn a GED
   Employers and schools typically require this.

2. Enroll in a diesel tech training program or apprenticeship
   These last 6-24 months and include hands-on experience.

3. Get hands-on shop hours
   Whether in school or work, real engine time is essential.

4. Pass ASE or manufacturer-specific certifications (optional but valuable)
   Certifications prove your skills and boost your pay.

5. Apply for diesel tech jobs
   Many employers hire entry-level techs with 1 year of training or less.

Certifications to Boost Pay

While not always required, these certifications help you earn more:

• ASE Diesel Certification (T2-T8)
• CDL (Commercial Driver's License)
• OEM Certifications (Cummins, CAT, Detroit Diesel)
• EPA 609 (HVAC Systems in vehicles)

ASE-certified diesel techs often earn $10K-$15K more per year than uncertified peers.

Training Options

• Trade Schools: Focused 6-18 month programs with job placement support
• Community Colleges: Combine diesel with general education
• Apprenticeships: Earn while you learn on the job
• Military/Veteran Pathways: Many diesel techs transition from service vehicles to civilian shops

Some employers will even pay for your training if you commit to working for them after.

Skills That Make Great Diesel Techs

• Strong diagnostic and troubleshooting abilities
• Mechanical aptitude and attention to detail
• Ability to work in loud, fast-paced environments
• Familiarity with engine computers and scan tools
• Comfort working under pressure and on tight deadlines

Pros & Cons of Diesel Technician Careers

Pros:

• High job security across transportation, agriculture, and logistics
• Excellent pay with certification and experience
• Low barrier to entry-no degree required
• Endless specialization paths (fleet, heavy equipment, marine diesel)

Cons:

• Physically demanding and often dirty
• Requires regular tool investment
• Exposure to noise, fumes, and heavy machinery

Start Your Diesel Tech Career

If you're ready to start turning wrenches and earning a reliable paycheck you can take the first step today.

• Explore Trade Schools Near You
• Get ASE Certification Info

Engines don't run themselves. You're the one that keeps them going.

Diesel Technician Salary by State