Fuel Your Future in Diesel Technology
The trucks that haul freight, the buses that move students and the machines that build roads all run on diesel. Keeping them on the road takes skilled technicians who understand how these engines work and how to fix them when they don't.
St. Louis Community College's diesel technology programs prepare you for that work. You'll learn diesel engine operation, fuel systems, electrical systems and computer diagnostics through classroom instruction and hands-on lab practice. You'll train with the same tools used by working technicians, so you're ready for the shop floor on day one.
Graduates step into entry-level roles at dealerships, maintenance facilities and other shops that keep large vehicles running. Choose from three credentials to match your goals and schedule: an associate in applied science (AAS), a certificate of proficiency (CP) or a certificate of specialization (CS).
What is Diesel Technology at St. Louis Community College?
Diesel technology is the field of diagnosing, repairing and maintaining the engines and systems that power heavy vehicles and equipment, including trucks, buses and construction machinery. Diesel technicians use mechanical skills, technology and problem-solving to keep these essential machines running safely and efficiently.
The programs combine classroom learning with hands-on experience in diesel engine operation, maintenance procedures and modern diagnostic technology. You'll build skills in:
- Diesel engine systems and repair.
- Fuel and air systems.
- Electrical and electronic systems.
- Computer diagnostics and troubleshooting.
- Preventive maintenance and heavy-duty vehicle service.
STLCC offers three program options:
Associate in applied science (AAS): Combines diesel technology training with general education courses, giving you a full college degree and the strongest foundation for career growth.
Certificate of proficiency (CP): Focused diesel technology training that prepares you for entry-level jobs in the diesel service industry.
Certificate of specialization (CS): Builds the core skills needed for common diesel service and maintenance tasks.

What Can You Do with a Diesel Technology Degree?
A diesel technology degree from STLCC prepares you for careers maintaining and repairing the vehicles and equipment that keep industries moving. Diesel technicians are in steady demand across the country as trucks, buses and heavy machinery get more complex and require more skilled hands to service.
Graduates work as diesel technicians, mechanics and service specialists across a wide range of industries, including transportation, construction, agriculture, mining and fleet maintenance. You could find yourself at a dealership, a fleet operation, a construction company or an independent repair shop, depending on the path you choose. With experience, you can move into specialized repair areas, master technician roles or shop leadership positions.
You can also combine your diesel technology degree with related STLCC certificates to expand your skills and career options. Related programs include automotive technology and automotive vehicle inspection and light maintenance. Stacking credentials can prepare you for a wider range of roles in the automotive and transportation industries.
- Degrees offered: Associate in applied science (AAS), certificate of proficiency (CP), certificate of specialization (CS)
- Locations: Forest Park
- AAS hours to complete: 60
- CP hours to complete: 42
- CS hours to complete: 18
- Program contact name: Daniel Borgers
- Program contact email: dborgers1@stlcc.edu
Tuition for district residents is $127 per credit hour for in-district students. Find out more about our straightforward and low-cost tuition structure.
Related Programs
At STLCC, you can combine this degree with a number of certificates to enhance your
career opportunities, such as:
Why You Should Choose Diesel Technology at STLCC

Schedules Built for Your Busy Life
Fitting a quality education into your busy life is easy with the flexibility STLCC offers, including day and evening classes, in-person and live virtual lectures, as well as online and hybrid options.

Graduate with Little or No Debt
We believe cost should never be a barrier to achieving your potential. Save over $4700 per year with tuition that's one-third lower than other local institutions.

Ramp Up High Wage Skills
STLCC offers career-focused programs for high-wage, high-skill and in-demand jobs. STLCC provides opportunities for college transfers, career development and workforce training. Certificate programs can establish you in a new career in as few as 12 weeks.

Build Skills You Need with Stackable Credentials
Stackable credentials help students level up career opportunities without investing a large amount of time and resources. Students can stack a series of traditional and nontraditional credentials including degrees, certificates, apprenticeships and more.
STLCC. What's your reason?