How to become a Diesel Mechanic: education, training and skills.
What workers in the job actually report about their education, experience and training, the skills to build first, and the stepping-stone roles that lead in.
- 39% Post-Secondary Certificate
- 37% High School Diploma or the equivalent (such as a GED)
Most diesel mechanics report needing a post-secondary certificate (39% of workers surveyed by O*NET). O*NET places the job in Job Zone 3 of 5 (medium preparation). The most common answer for related work experience was “over 1 year, up to and including 2 years” (35%), and for on-the-job training “over 1 year, up to and including 2 years” (41%).
Data Government data groups this job as Bus and Truck Mechanics and Diesel Engine Specialists (O*NET-SOC 49-3031.00). Figures on this page are for that occupation.
Six steps to becoming a Diesel Mechanic
Data Steps 1 to 5 summarise O*NET data for the role; step 6 is advice.
- EducationPlan for a post-secondary certificate
39% of workers report it as required. 77% report no college degree needed.
- TrainingExpect on-the-job training
Most common: over 1 year, up to and including 2 years.
- ExperienceRelated experience
Most common: over 1 year, up to and including 2 years (35% of workers).
- SkillsBuild the core skills
Troubleshooting, Repairing, Operations Monitoring are rated most important.
- ToolsLearn the tools
Autodesk AutoCAD, Dassault Systemes SolidWorks, Microsoft Excel.
- CredentialsCheck licensing where you live
Many occupations need a state license or certification. Requirements vary by state, so confirm with your state's licensing board.
What workers report
Data Share of workers giving each answer, O*NET.
O*NET Job Zone 3 (Medium Preparation Needed): Previous work-related skill, knowledge, or experience is required for these occupations. For example, an electrician must have completed three or four years of apprenticeship or several years of vocational training, and often must have passed a licensing exam, in order to perform the job.
Related roles that need less preparation
Data O*NET related occupations in a lower Job Zone with a skill match of 65% or more.
Data Pay once you are in the job: the BLS median is $61,770; the lowest-paid quarter earn $50,540 or less. See the full Diesel Mechanic salary data.
How this page is built
Education, experience, training and Job Zone come from O*NET 31.0 survey data for the occupation. Stepping-stone roles use our skill-match score: Skill match is the correlation between the two occupations' skill profiles: for each of 35 O*NET skills (10 essential, 25 transferable) we multiply importance by level, subtract the average across all occupations, and correlate the two profiles. 100 means identical shape; 0 or below means unrelated. Only occupations that O*NET itself lists as related are compared.
- Licensing rules in your state.
- Requirements at a specific employer.
- How long the path will take you personally.
- O*NET 31.0 Database, U.S. Department of Labor, Employment and Training Administration (USDOL/ETA), used under the CC BY 4.0 license. TryHired selected, ranked and combined the data; O*NET is not responsible for these pages.
- U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025 estimates (public domain).
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