Track DSL
Diesel & Heavy Duty
Duramax, Powerstroke, Cummins, plus semi trucks.
What this certification means
Diesel & Heavy Duty covers diesel-powered light-duty trucks (Duramax, Powerstroke, Cummins) and Class 7-8 heavy-duty operations. Premium-value certification.
What it covers
- Diesel fuel systems: high-pressure common rail, HEUI, mechanical injection
- Turbocharger diagnosis and service (VGT, twin-turbo)
- DPF (diesel particulate filter) service and regeneration
- EGR system diagnosis and service
- DEF (diesel exhaust fluid) system diagnosis
- Fuel injector testing (electronic and mechanical)
- Boost leak testing methodology
- Class 7-8 introductions: air brake, PTO, heavy-duty electrical
Who this is for
Mobile diesel mechanics, a high-margin specialization where jobs pay 1.5-2x standard rates.
Exam
75 questions · 90 minutes · 78% to pass
Price
Free
Includes
Digital badge + printed certificate + verify page
Valid for
5 years · free recertification
EXAM AVAILABLE NOW
Ready to certify? Take the DSL exam.
45 questions · 60 minutes · 75% to pass · free · Digital certificate on pass
Immediate access, take the exam within 30 days at your convenience. Fail one and you can retake it right away, free, as many times as you like.