Diesel Mechanic in Missouri: Salary, License Requirements, and How to Start
Repair and maintenance
Missouri employs 6,780 diesel mechanics, with a statewide median of $59,360 and wide variation by city and experience. Here is the real wage data, the exact Missouri licensing picture, and where to train.
What Diesel mechanics Earn in Missouri (May 2025)
- Missouri median pay
- $59,360 (May 2025)
- Starting range (10th percentile)
- $41,170
- Experienced (75th percentile)
- $69,000
- Top earners (90th percentile)
- $82,480
- Employed in Missouri
- 6,780
- U.S. median (for comparison)
- $60,660 (May 2024)
Wages vary substantially by metro. Median annual pay for diesel mechanics in major Missouri markets:
- Springfield
- $62,000 (130 employed)
What That Pay Is Worth in Missouri
Prices in Missouri run about 9% below the national average (cost-of-living index 90.8 vs a U.S. baseline of 100, 2024), so the $59,360 median stretches to roughly $65,374 in national buying-power terms.
Job Outlook in Missouri (2024–2034)
Missouri is projected to grow diesel mechanics employment +3.3%, faster than the +2.4% projected nationally. The state expects about 590 openings a year, counting both growth and workers who retire or move on.
Missouri License and Certification Requirements
ASE Medium/Heavy Truck Certification (national — no state license) — regulated by the No Missouri state license required for diesel mechanics.
- Missouri does not require a state license for diesel mechanics. The recognized credential is ASE (National Institute for Automotive Service Excellence) Medium/Heavy Truck certification (Series H: H1–H8 cover the main diesel systems; T-Series covers transit buses). Most employers consider ASE certification when making hiring and wage decisions.
- Entry paths: (1) Enroll in a diesel technology program at a community or technical college (12–24 months) to earn foundational theory and lab experience, then enter the industry. (2) Start as a lube tech or diesel apprentice helper at a dealership or fleet shop and work toward certifications on the job.
- Manufacturers (Caterpillar, Cummins, Detroit Diesel, Allison) offer factory training for their specific engines — a strong career differentiator. EPA 609 certification is required to work on A/C systems in heavy trucks.
Official requirements: No Missouri state license required for diesel mechanics →
Training in Missouri
Major diesel employers in Missouri include Kenworth, Peterbilt, and Freightliner dealerships; large trucking fleets (Werner, J.B. Hunt, Amazon Logistics); municipalities (bus fleets, heavy equipment); and construction/mining equipment dealers. ASE-certified technicians consistently earn $5–$10/hr more than non-certified peers.
Real training providers and registered apprenticeships in Missouri include:
- Aviation Institute of Maintenance-Kansas City — Certificate
- Cape Girardeau Career and Technology Center — Certificate
- Crowder College — Certificate / Associate
- East Central College — Certificate / Associate
Is This the Right Move for You?
Best for: People who like large, powerful machinery and want solid wages without a 4-year degree.
Think twice if: Grease, diesel exhaust, heavy components, and shop environments sound miserable rather than satisfying.
Why it's resilient: Diesel engines power trucks, buses, heavy equipment, and generators — hands-on diagnosis and repair that cannot be done remotely.
First Steps
Look for diesel technology programs at community colleges and vocational schools, or apply directly as a shop helper.
Frequently Asked Questions
How much do diesel mechanics make in Missouri?
The median wage for diesel mechanics in Missouri is $59,360 per year (May 2025, BLS). Entry-level pay (10th percentile) starts around $41,170, and top earners (90th percentile) make about $82,480. Pay varies by metro and years of experience.
What license or certification do you need to become a Diesel Mechanic in Missouri?
ASE Medium/Heavy Truck Certification (national — no state license), overseen by the No Missouri state license required for diesel mechanics. Missouri does not require a state license for diesel mechanics. The recognized credential is ASE (National Institute for Automotive Service Excellence) Medium/Heavy Truck certification (Series H: H1–H8 cover the main diesel systems; T-Series covers transit buses). Most employers consider ASE certification when making hiring and wage decisions.
Is being a Diesel Mechanic a good career in Missouri?
Diesel engines power trucks, buses, heavy equipment, and generators — hands-on diagnosis and repair that cannot be done remotely.
Which Missouri metros pay diesel mechanics the most?
Among Missouri metro areas, Springfield leads at $62,000. Local pay tracks regional demand and cost of living, so the highest-paying metro isn't always the best net move.
Where can I train to become a Diesel Mechanic in Missouri?
Real Missouri options include Aviation Institute of Maintenance-Kansas City, Cape Girardeau Career and Technology Center, Crowder College. Most diesel mechanics start with an accredited program, then earn the credential the state or employer requires.
Is Diesel Mechanic a growing career in Missouri?
Missouri projects diesel mechanics employment to change +3.3% from 2024 to 2034, with about 590 openings a year — a growing field in the state.
Sources and Verification
Wage data: U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (May 2025), Missouri statewide and metro estimates for SOC 49-3031. Licensing summary compiled from the No Missouri state license required for diesel mechanics (2026-06-11). Requirements change — always confirm current rules with the board and verify program costs and outcomes before enrolling.
BLS Occupational Outlook · O*NET Missouri wages · Missouri licensing/certification source
Employment projections: Projections Central / BLS Employment Projections (2024–2034); Cost of living: BEA Regional Price Parities.
Pay percentiles describe current workers, not entry-level offers; training costs and local demand vary, so verify locally before committing money or quitting a job.