Diesel Service Technician - (Diagnostic, Major Repair)

Diagnostic TechnicianThe Diagnostic Technician is responsible for performing advanced diagnostics, troubleshooting, and major mechanical repairs on heavy-duty trucks and commercial vehicles. This role specializes in identifying and resolving complex issues involving diesel engines, transmissions, electrical systems, aftertreatment systems, and vehicle electronics. The technician is expected to provide accurate diagnoses while maintaining high standards of quality, safety, and efficiency.Essential Duties and ResponsibilitiesPerform advanced diagnostics using OEM diagnostic software and tools.Diagnose and repair heavy-duty diesel engines, including International and Cummins.Diagnose, troubleshoot, and repair manual and automatic transmissions, including Allison and Eaton.Perform major engine repairs, including overhauls, in-frame rebuilds, cylinder head replacement, turbocharger replacement, and fuel system repairs.Perform major transmission replacements.Diagnose and repair electrical and electronic systems, including CAN communication networks.Troubleshoot emissions and aftertreatment systems (DPF, DOC, SCR, DEF systems).Perform engine performance testing and road testing to verify repairs.Accurately document diagnostic procedures, findings, and repairs in the repair order.Work closely with Service Advisors and the Service Manager to communicate repair recommendations.Assist other technicians with difficult diagnostic concerns when needed.Follow OEM repair procedures and warranty guidelines.Maintain a clean, organized, and safe work environment.Complete repairs efficiently while meeting productivity and quality standards.Participate in manufacturer training and maintain required certifications.Required QualificationsMinimum of 5 years of experience diagnosing and repairing heavy-duty diesel trucks.Strong knowledge of International trucks, Cummins engines, Allison transmissions, and Eaton transmissions.Experience with OEM diagnostic software such as International ServiceMaxx, Cummins INSITE, Allison DOC, and Eaton ServiceRanger.Strong understanding of diesel engine operation, fuel systems, electrical systems, air systems, and emissions systems.Ability to interpret wiring diagrams, service manuals, and technical bulletins.Valid driver's license (CDL preferred).Preferred QualificationsASE Medium/Heavy Truck Certifications.International, Cummins, Allison, or Eaton factory certifications.HVAC and EPA certification is a plus.Welding and fabrication experience is desirable.SkillsAdvanced diagnostic and troubleshooting abilities.Strong analytical and problem-solving skills.Excellent communication and documentation skills.Ability to work independently with minimal supervision.Team-oriented with a strong customer service mindset.Ability to prioritize multiple repairs in a fast-paced environment.Physical RequirementsAbility to lift up to 75 lbs.Ability to stand, bend, kneel, and work under vehicles for extended periods.Ability to operate shop equipment safely.Ability to work in varying temperatures and shop conditions.Performance ExpectationsMaintain high first-time repair accuracy.Produce clear and complete diagnostic documentation.Complete repairs according to OEM specifications.Support shop productivity by resolving complex repairs efficiently.Maintain a safe and professional work environment.Demonstrate continuous learning through manufacturer training and certifications.We are an equal opportunity employer and prohibit discrimination/harassment without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.