Automotive Technician vs Diesel Technician
An automotive technician mainly services gasoline cars and light trucks. A diesel technician works on diesel engines and the fuel, emissions and drivetrain systems around them, often on larger commercial trucks and equipment. Both diagnose and repair for a living and many skills carry over. The real differences are the vehicles, the tools and the certification path.
Data as of October 20, 2026.
Side by side
| Compared | Automotive Technician | Diesel Technician |
|---|---|---|
| Area of the dealership | Technicians | Technicians |
| U.S. median pay (BLS) | $50,620 | $61,770 |
| Phoenix metro median pay (BLS) | $50,090 | $63,330 |
| ASE certification guides | ASE Master Automobile Technician, ASE L3 Hybrid/Electric Vehicle Specialist | ASE Medium-Heavy Truck (T1 to T8), ASE Advanced Level (L1, L2, L4) |
| Open jobs on AutoHire now | 1 | 0 |
Pay is the BLS national and Phoenix metro median annual wage for the closest BLS occupation, all industries. Open jobs are live counts on AutoHire.
What an Automotive Technician does
- Inspect vehicles and diagnose faults using scan tools and manufacturer procedures.
- Perform scheduled maintenance, repairs and recall or warranty work.
- Document work performed so advisors can explain it to customers.
How People Get Started
- Complete an automotive program at a trade school or community college, or start as a lube or entry-level technician.
- Build experience across systems and earn ASE certifications as you go.
- Specialize in a brand, diagnostics, or a growing area such as electric vehicles.
What a Diesel Technician does
- Diagnose engine, fuel, emissions and aftertreatment problems on diesel vehicles.
- Service and repair brakes, drivetrains, suspension and electrical systems.
- Perform scheduled maintenance and document the work on repair orders.
How People Get Started
- Complete a diesel technology program at a trade school or community college, or start as a shop helper or lube technician.
- Build experience on engines, emissions systems and heavy-duty electrical work.
- Specialize in a manufacturer, fleet maintenance or diagnostics.
How the work differs
Automotive technicians spend most of their day on passenger cars, SUVs and light trucks. The work ranges from scheduled maintenance and brake jobs to electrical and engine performance diagnosis, and a steady share of it is warranty and recall work at a dealership.
Diesel technicians work on compression-ignition engines, fuel injection, turbochargers and exhaust aftertreatment, and on heavier chassis parts such as large drivetrains and air brake systems. Parts are bigger and heavier, and a truck that is down is often a business that is not earning, so fast and accurate diagnosis carries extra weight.
The two overlap more than the job titles suggest. Many dealerships service light-duty diesel pickups, and many truck shops also work on gasoline engines, so a technician with a mixed background can fit either side.
Where each one works
Automotive technicians are found at new and used car dealerships, independent repair shops, quick-service lube centers and fleet garages. Brand-specific dealership work leans on manufacturer procedures and scan tools.
Diesel technicians are common at truck dealers, fleet maintenance shops, bus and transit operators, equipment dealers and independent repair shops. Some employers expect on-call hours or a shift schedule built around keeping a fleet on the road, so ask about schedule before you accept an offer.
Training and certification
ASE splits its technician tests into an Automobile and Light Truck series and a separate Medium-Heavy Truck series. Light-vehicle diesel engines have their own test in the automobile series, while the Medium-Heavy Truck series covers diesel engines, brakes, electrical systems and preventive maintenance inspection on larger trucks. Advanced-level tests exist for electronic diesel diagnosis. See the certification guides linked on this page for the current test details.
Engine and truck manufacturers also run their own training programs. For either path, a trade school or college program is a common way in, and so is starting as a lube technician or shop helper and learning on the job.
Which one fits you
Choose automotive technician work if you like variety, want a large number of employers to choose from and enjoy the technology in modern passenger vehicles, from driver-assistance systems to infotainment and electrification.
Choose diesel technician work if you prefer heavy equipment, enjoy engine and emissions diagnosis and are comfortable working on large components. Commercial fleets, trucks and buses keep this a steady specialty in many regions, though demand varies by location.
Moving from one to the other is realistic. An automotive technician can add heavy-duty training and experience with engines and aftertreatment, and a diesel technician can add light-vehicle systems and manufacturer training for a specific car brand.
What the official pay data shows
The U.S. Bureau of Labor Statistics publishes separate wage data for both roles. Automotive Technician: a median of $50,620 a year in the United States and $50,090 in the Phoenix-Mesa-Chandler, AZ metro area (BLS occupation "Automotive Service Technicians and Mechanics", May 2025). Diesel Technician: a median of $61,770 a year in the United States and $63,330 in the Phoenix-Mesa-Chandler, AZ metro area (BLS occupation "Bus and Truck Mechanics and Diesel Engine Specialists", May 2025). On these medians Diesel Technician is higher by $11,150 a year.
These are national occupation medians across all industries and employers, not dealership pay. Real offers depend on the pay plan, the store, the brand, your experience and the local market, so compare the written plan in each offer.
Automotive Technician vs Diesel Technician: common questions
Is a diesel technician the same as an automotive technician?
No, though they are close cousins. Both diagnose and repair vehicles. A diesel technician specializes in diesel engines and heavy-duty systems, while an automotive technician mostly services gasoline cars and light trucks.
Can an automotive technician work on diesel trucks?
Often yes, especially on light-duty diesel pickups, but heavy-duty trucks usually call for extra training. Employers decide what experience they require, so read each job description.
Do diesel technicians need different ASE tests?
ASE offers a separate Medium-Heavy Truck series for larger trucks, in addition to a light-vehicle diesel test in its automobile series. Which tests help depends on the work you do.
Which role has more job openings?
The live counts in the table on this page show open jobs on AutoHire for each role right now. Openings change daily and vary by city.
Do I need a degree for either role?
No degree is required for either one. Many technicians complete a trade school or college program, and some employers hire entry-level helpers and train them on the job.
How this comparison is built
Pay figures are U.S. Bureau of Labor Statistics Occupational Employment and Wage Statistics estimates. They cover wage and salary workers in every industry, count commissions and production bonuses and leave out the self-employed and benefits. Where a role has no exact BLS occupation, no figure is shown. Certification details come from the ASE guides on AutoHire, checked October 20, 2026. Job counts are live. The role descriptions were written by AutoHire and reviewed on the date shown.
Sources
- BLS OEWS, Automotive Service Technicians and Mechanics (49-3023) (data as of May 2025)
- BLS OEWS, Bus and Truck Mechanics and Diesel Engine Specialists (49-3031) (data as of May 2025)
- ASE: Automobile & Light Truck tests A1 to A9 (data as of October 20, 2026)
- ASE: Work experience requirements (data as of October 20, 2026)
- ASE: Recertification and the ASE Renewal App (data as of October 20, 2026)
- ASE: Light Duty Hybrid/Electric Vehicle Specialist test L3 (data as of October 20, 2026)
- ASE: Test registration and fees (data as of October 20, 2026)
- ASE: Medium-Heavy Truck tests T1 to T8 (data as of October 20, 2026)
- ASE: Electronic Diesel Engine Diagnosis Specialist test L2 (data as of October 20, 2026)
- ASE: Advanced Engine Performance Specialist test L1 (data as of October 20, 2026)
- ASE: ADAS Specialist test L4 (data as of October 20, 2026)
Data as of October 20, 2026.
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