ASE offers T-series certification tests for medium and heavy duty trucks

These exams give professionals the opportunity to demonstrate their skills and expertise to future employers.
April 27, 2026
2 min read

For automotive service professionals looking to renew or enhance their certifications, the National Institute for Automotive Service Excellence (ASE) offers T-Series certification tests for work on medium and heavy duty trucks. 

Designed to identify and recognize medium and heavy duty truck technicians who demonstrate the knowledge and skills necessary to diagnose, service, and repair different systems of Class 4 through 8 trucks and tractors, ASE offers eight T-Series certification tests. The tests include gasoline engines (T1); diesel engines (T2); drive train (T3); brakes (T4); suspension and steering (T5); electrical/electronic systems (T6); heating, ventilation and air conditioning (HVAC) (T7) and preventive maintenance inspection (T8). Those who are certified in tests T2–T8 are recognized as ASE Certified Master medium-heavy truck technicians.

A free online study guide is available with test specifications, task lists, sample questions, and training resources. 

A word from ASE

“The ASE medium and heavy-duty truck certification exams allow service professionals to demonstrate to employers and customers that they possess the skills and expertise needed to service and repair trucks across all class levels,” said Dave Johnson, president and CEO of ASE. “Passing these rigorous ASE truck certification exams give technicians the confidence of knowing they rank among the best in their field.”

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