Senior Diesel Technician — Lead Diagnostics & Mentorship

Automatic Data Processing, Inc.

Bolingbrook (IL)

On-site

USD 52,000 - 61,000

Full time

7 days ago

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Job summary

Tractor Shop in Bolingbrook, IL is seeking a Diesel Technician III to provide expert diagnostics, complex repairs, and leadership in a fast-paced truck service environment. You will mentor junior techs, ensure high repair quality, and maintain comprehensive documentation.

The role requires at least 5 years of diesel repair experience, proficiency with OEM diagnostic tools, and strong electrical/system knowledge. Work is performed in a shop setting with safety protocols and PPE required.

Qualifications

Minimum 5 years of diesel truck or heavy equipment repair experience.
Advanced diagnostic skills using OEM software (Cummins INSITE, Detroit DiagnosticLink, Navistar).
Strong understanding of electrical systems, aftertreatment systems, and vehicle data networks.
Ability to read and interpret wiring diagrams, schematics, and service manuals.

Responsibilities

Perform expert-level diagnostics on complex mechanical, electrical, aftertreatment, and driveline systems.
Troubleshoot and repair aftertreatment and emissions systems (DPF, DOC, SCR).
Repair transmissions, driveline components, and high-level electrical faults.
Mentor junior technicians and support shop leadership on quality controls.