Skilled trades and making things · Ohio
Diesel mechanic: what the job actually is
Keeping trucks, buses and other diesel-powered machines running, through inspections, diagnosis and heavy repair.
By Nick Gonzalez, founder, U.S. Air Force veteranChecked against official Ohio sources Pay: U.S. Bureau of Labor Statistics, May 2025
The work
What this job actually is
- Preventive maintenance: inspections, oil and filter changes, and checking brakes, lights and tires on trucks that may drive hundreds of miles a day.
- Diagnosis with laptops and scan tools on engines, emissions systems and electronics, then the heavy wrenching to fix what you found.
- Parts are big and heavy. You use lifts, jacks and cranes, but your back still does a lot of the work.
- Fleets, dealerships, bus systems and roadside repair all hire diesel techs. Roadside means fixing a truck on a highway shoulder in the rain.
- A truck that is not moving is losing someone money, so there is time pressure on most jobs.
A Tuesday
What a normal day looks like
Not a good day or a bad one. The ordinary version, which is what you would actually be living.
- 6:00: Early start. Trucks need to roll by 7, so the morning goes to whatever broke overnight.
- 6:15: A truck will not start. Test the batteries and starter, find a corroded cable, fix it, send it out.
- 8:00: Scheduled inspection on a tractor: brakes, lights, steering, suspension, leaks. Write down everything.
- 10:30: Plug a laptop into an engine that keeps losing power. Read the codes, check the fuel and the turbo.
- 12:00: Lunch.
- 12:30: Pull and replace a heavy component with a coworker and a hoist. Slow, careful and dirty.
- 3:30: Road test, finish the paperwork, clean the bay.
Honestly
Who loves this, and who should not do it
- Big machines interest you more than cars.
- You like diagnosing problems with both a laptop and a wrench.
- You are strong and do not mind physical, dirty work.
- You like being the person who keeps everything else moving.
- Grease, fumes, noise or cold shops would wear you down.
- You do not want to work early mornings, nights or weekends. Many fleets run around the clock.
- Heavy lifting is a problem for you.
- You do not want to keep learning as engines and electronics change.
The route in
How you actually get there in Ohio
Finish high school, ideally with career-tech
Most employers require a high school diploma or equivalent and may prefer postsecondary training in diesel repair from a community college or technical school. People without it are trained extensively on the job, starting with basic tasks.Earn ASE Medium/Heavy Truck Entry-Level certifications as a student
ASE Entry-Level tests include medium/heavy truck areas like diesel engines, brakes and electrical systems. They do not require work experience and can count toward the experience needed later.Work, then earn ASE truck certifications
ASE's T1 to T8 medium/heavy truck tests need two years of hands-on experience for full certification, and school can substitute for part of it. Certifications last five years.Get a commercial driver's license if your job needs it
Some diesel techs need a CDL to test-drive trucks and buses. In Ohio you must be at least 18 with a valid Ohio driver's license, get a commercial learner's permit, and complete federally required entry-level driver training. Drivers under 21 are limited to driving within Ohio.
While you are still in high school
- Ohio school districts must offer career-technical education in grades 7 through 12. Ask your counselor whether your career center has a diesel, truck or heavy equipment program.
- ASE student certifications in medium/heavy truck diesel engines, brakes, electrical and inspection are on Ohio's industry-recognized credentials list.
- Ohio Technical Centers offer adult skilled-trades training, which is an option after high school if your school has no diesel program.
Where this comes from: U.S. Bureau of Labor Statistics: How to become a diesel service technician · ASE: Work experience requirements and training substitutions · ASE Education Foundation: Entry-Level certification · Ohio BMV: Commercial driver's license · Ohio Department of Higher Education: Ohio Technical Centers · Ohio Department of Education and Workforce: career-technical education admissions FAQ · Ohio Department of Education and Workforce: industry-recognized credentials. Rules change, so check the official page before you rely on a detail.
The money
What it pays in Ohio
Last on purpose. Pay matters, but it is a bad reason to pick a job you would dislike for thirty years.
- $60,470
- Median pay in Ohio, a year
- $29.07
- Median pay in Ohio, an hour
- 14,240
- People doing this job in Ohio
- $61,010
- Median pay in the Akron area, a year
Most people in Ohio earn between $44,860 (the lowest-paid tenth, usually new starters) and $78,120 (the highest-paid tenth) a year.
U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025: Ohio and Akron, OH metro area. Median means half earn more and half earn less.
Try it this week
Spend a morning around big trucks
Find a local fleet, bus garage or truck dealership and ask whether a technician could give you a 30-minute tour of the shop.
Before you go, watch a video of a truck pre-trip inspection and make a list of what gets checked.
At the shop, notice the noise, the smell and the size of the parts. Ask what a new tech does in their first month.
Afterward, write down honestly whether you could see yourself there every day.
Questions to ask somebody who does it
- What kind of fleet or equipment do you work on?
- What shift do you work, and does it change?
- Did you need a CDL, and how did you get it?
- Which ASE truck tests mattered most to your employer?
- What do new techs struggle with the most?
Can you own one?
Yes, though it takes more equipment than most trades: a shop with heavy lifts, or a service truck for roadside and on-site repair. Ohio's contractor licensing board does not cover diesel repair, so the work starts with business setup, insurance and any local rules. A CDL helps if you will move customers' trucks. Many owners start by doing on-site repair for farms, contractors or small fleets.
Thinking about it? How to start a business in Ohio and the free Business 101 course are the place to begin.
Questions
Quick answers
- How much does a diesel mechanic make in Ohio?
- The median pay for a diesel mechanic in Ohio is $60,470 a year ($29.07 an hour), according to the U.S. Bureau of Labor Statistics for May 2025. Most people earn between $44,860 and $78,120.
- How do you become a diesel mechanic in Ohio?
- Finish high school, ideally with career-tech. Earn ASE Medium/Heavy Truck Entry-Level certifications as a student. Work, then earn ASE truck certifications. Get a commercial driver's license if your job needs it.
- Can you own your own business as a diesel mechanic in Ohio?
- Yes, though it takes more equipment than most trades: a shop with heavy lifts, or a service truck for roadside and on-site repair. Ohio's contractor licensing board does not cover diesel repair, so the work starts with business setup, insurance and any local rules. A CDL helps if you will move customers' trucks. Many owners start by doing on-site repair for farms, contractors or small fleets.
Close cousins
Jobs like this one
- Automotive service technicianInspecting, diagnosing and repairing cars and light trucks, from oil changes and brakes to computer-controlled engines and electric vehicles.$48,710 a year
- Truck driverDriving heavy trucks that move goods between warehouses, stores, factories and job sites, local or across the country.$59,800 a year
- Heavy equipment operatorRunning excavators, dozers, loaders, graders and cranes that move earth and material on construction sites, roads and pipelines.$64,940 a year
- Industrial maintenance mechanicKeeping a factory's machines running: fixing breakdowns fast, and doing the routine maintenance that stops them breaking in the first place.$65,130 a year
Still deciding?