Diesel Technician III at Unlimited Carrier Inc – Bolingbrook, Illinois

Job Description

Job Title: Die D sel Technician III Department: Truck Service Point

Reports to: S Shop Foreman Effective Date: 03/05/26

Position Overview

The Diesel Truck Technician III is a highly skilled, senior-level technician responsible for performing complex diagnostics and advanced repairs on diesel-powered trucks and related equipment. This role serves as a technical expert within the shop, providing leadership, mentoring junior technicians, and ensuring high-quality repair standards.

Key Duties and Responsibilities

Responsibilities include but are not limited to:

Advanced Diagnostics & Repair

• Perform expert-level diagnosis on complex mechanical, electrical, aftertreatment, and

driveline systems.

• Troubleshoot and repair:

o Diesel engines

o Aftertreatment & emissions systems (DPF, DOC, SCR)

o Multiplexing & CAN bus systems

o High-level electrical faults and communication issues

o Transmission and driveline components

• Conduct engine performance testing, calibrations, and software updates using OEM tools.

Major Component Repair

• Perform engine component replacement (turbochargers, injectors, EGR systems, pumps).

• Replace major assemblies such as transmissions, differentials, and axles.

• Execute advanced brake, suspension, and steering repairs.

Preventative Maintenance & Compliance

• Conduct and verify all levels of PM (A/B/C) including advanced inspection points.

• Perform DOT inspections and ensure full regulatory compliance.

• Identify root causes of recurring fleet issues and recommend corrective measures.

Leadership, Training & Technical Support

• Mentor and train Technicians I and II on best practices, troubleshooting, and repair methods.

• Serve as a technical resource for complex job assignments.

• Support shop leadership in quality control.

Documentation & Reporting

• Document repairs, diagnostics, and parts usage thoroughly in maintenance systems.

• Contribute to procedural improvements and standard operating practices.

Safety & Shop Standards

• Lead by example in following all safety protocols and PPE requirements.

• Identify hazards and take corrective action to maintain a safe work environment.

• Ensure proper use and care of shop tools, equipment, and diagnostic devices.

Skills and Requirements

Required Qualifications

• Minimum 5+ years of experience in diesel truck or heavy equipment repair.

• Advanced diagnostic skills with OEM software (e.g., Cummins INSITE, Detroit DiagnosticLink,

Navistar).

• Strong understanding of electrical systems, aftertreatment systems, and data networks.

• Ability to read complex wiring diagrams, schematics, and service manuals.

• Valid driver’s license.

• Ability to lift 50+ lbs. and perform physically demanding work.

Preferred Qualifications

• Formal diesel technology education or equivalent experience.

• Multiple ASE Medium/Heavy Truck (T-Series) certifications, or ASE Master certified.

• OEM-specific training or certifications (Cummins, Detroit, PACCAR, Navistar, Allison).

• Experience training or mentoring other technicians.

• Strong communication and leadership skills.

• CDL Class A or B

Work Environment

• Shop environment with exposure to noise, fumes, and heavy machinery.

• Requires standing, bending, lifting, and use of heavy tools.

• May require occasional outdoor work depending on facility setup.

Salary

Pay Range: $36.00 – $43.00 per hour, based on experience, certifications, and shift.