Diesel Technician II

Unlimited-Carrier; Bolingbrook (IL); On-site; USD 39,000 - 50,000; Full time

Job summary

Unlimited-Carrier in Bolingbrook, IL is seeking a Diesel Truck Technician II to perform intermediate repairs, diagnostics, and preventative maintenance on diesel-powered trucks and fleet equipment. You will work independently on most repairs and assist junior technicians with training.

The role requires solid technical competency, the ability to read schematics, operate diagnostic tools, and lift 50+ lbs. A valid driver’s license is required and the position includes on-site work with

Qualifications

• High school diploma or GED required.
• 2–4 years of diesel or automotive technician experience.
• Proficiency with diagnostic tools and repair procedures.
• Ability to read schematics, wiring diagrams and technical manuals.
• Valid driver's license required.
• Ability to lift 50+ lbs and perform physically demanding tasks.

Responsibilities

• Perform intermediate diagnosis and repair of mechanical, electrical, and emission-related issues.
• Troubleshoot and repair diesel engines, aftertreatment systems, electrical and charging, cooling, brakes and air systems, suspension and steering.
• Use diagnostic tools and OEM software to identify root-cause issues.
• Perform component replacements, adjustments and calibrations as required.
• Document all work orders, labor hours, parts used and findings.
• Maintain safe, organized shop environment and communicate status to supervisors.

Skills

Diesel tech experience

Diagnostics tools

Schematics reading

Physical strength

Valid driver's license

Education

High school diploma or GED

Tools

OEM software

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Full Time Employee Bolingbrook, IL, US

Salary Range: $28.00 To $36.00 Hourly

Department: Truck Service Point
Reports to: Shop Foreman
Effective Date: 09/08/26

Position Overview

The Diesel Truck Technician II is a mid-level technician responsible for performing intermediate repairs, diagnostics, and preventative maintenance on diesel-powered trucks and related fleet equipment. This role requires solid technical competency, the ability to work independently on most repairs, and the capability to assist lower-level technicians with training and troubleshooting.

Key Duties and Responsibilities

Responsibilities include but are not limited to:

Diagnostics & Repair

• Perform intermediate-level diagnosis and repair of mechanical, electrical, and emission-related issues.
• Troubleshoot and repair:
  • Diesel engines
  • Aftertreatment systems (DPF, DOC, SCR)
  • Electrical and charging systems
  • Cooling systems
  • Brake and air systems
  • Suspension and steering components
• Use diagnostic tools and OEM software to identify root-cause issues.
• Perform component replacements, adjustments, and calibrations as required.

Preventative Maintenance & Inspections

• Perform and sign off on PM A/B/C services.
• Conduct DOT-level inspections and ensure equipment meets regulatory compliance.
• Identify and document potential failures or safety hazards during PMs.

Documentation & Reporting

• Accurately document all work orders, labor hours, parts used, and diagnostic findings.
• Maintain clear communication with supervisors regarding equipment status.
• Provide repair recommendations and improvement suggestions for recurring issues.

Safety & Shop Standards

• Follow all company safety programs and PPE requirements.
• Maintain a clean, organized, and hazard-free work environment.
• Properly use shop equipment, lifts, and specialty tools.
• Assist Diesel Technician I personnel with troubleshooting and hands-on training.
• Provide guidance on proper repair procedures and shop best practices.
• Support overall shop efficiency and workflow.

Skills and Requirements

Required Qualifications

• High school diploma or GED.
• 2-4 years of experience as a diesel or automotive technician.
• Proficiency with diagnostic tools and repair procedures.
• Ability to read schematics, wiring diagrams, and technical manuals.
• Valid driver's license.
• Ability to lift 50+ lbs and perform physically demanding tasks.

Preferred Qualifications

• Completion of a diesel or automotive technical program.
• OEM training (e.g., Cummins, Detroit, PACCAR, Navistar) is highly desirable.
• ASE Medium/Heavy Truck certifications (T-Series).
• Demonstrated ability to train or mentor junior technicians.
• CDL Class A or B.
• Shop setting with exposure to noise, fumes, moving vehicles, and heavy machinery.
• Requires physical activity including standing, kneeling, climbing, and lifting.
• May require occasional outdoor work depending on facility setup.

Pay Range: $28.00-$36.00 per hour, depending on experience, certifications, and shift assignment.