careers

Lead Diagnostic Mechanic (Semi-Trucks)

We are seeking a Lead Diagnostic Mechanic with strong expertise in semi-truck diagnostics and repairs. This is a key role for our operations, and the ideal candidate will have proven hands-on experience in troubleshooting and repairing a variety of truck systems using advanced diagnostic tools and software. This position requires a deep understanding of electrical systems, engine diagnostics, computer-based troubleshooting, and the ability to work across multiple truck brands and models.

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Responsibilities:

  • Perform advanced diagnostics and troubleshooting using OEM and aftermarket diagnostic software
  • Diagnose and repair electrical systems, ECM, sensors, aftertreatment systems, and emissions control components
  • Lead diagnostic procedures and support other technicians in identifying and resolving complex issues
  • Work on various semi-truck brands including Volvo, Freightliner, International, Mack, Kenworth, Peterbilt, and others
  • Maintain documentation of repairs and diagnostics performed
  • Communicate effectively with the service team and fleet managers regarding repairs and timelines
  • Ensure work is done in compliance with safety regulations and company standards

Requirements:

  • Minimum 5+ years of experience as a diesel mechanic with a strong background in diagnostics
  • Extensive knowledge of computer-based diagnostic tools (OEM software preferred)
  • Expertise in electrical troubleshooting and advanced diagnostics
  • Experience working with multiple semi-truck brands, especially: Volvo, Freightliner, International, Mack, Kenworth, etc.
  • Strong problem-solving skills and ability to lead complex diagnostic processes
  • Valid driver’s license (CDL preferred but not required)
  • Ability to work independently and as a team leader in a fast-paced environment

Preferred Qualifications:

  • Certifications from OEMs or ASE
  • CDL-A license
  • Bilingual is a plus

Pay: $40.00 - $45.00 per hour

Benefits:

  • 401(k)
  • 401(k) matching
  • Dental insurance
  • Health insurance
  • Paid time off
  • Vision insurance

services

Truck & Trailer Diesel Mechanic Services

With multiple locations in Illinois, Iowa & Texas, Merx Truck & Trailer has built a reputation for industry-leading heavy-duty diesel mechanic service. We proudly provide commercial trucks & fleets with trusted repair & maintenance services, from DOT inspections and preventive maintenance services, to heavy-duty truck repairs & everything in between. Schedule the services you require with Merx today at the location nearest you!

Best shop in Illinois! Very ethical team, no hidden charges and lies. Ask for Filip, he takes care of your issues. They do everything, from paint job to overhaul of engines. Luis is great!
SIP Logistics
5 star review

"Great service! Got me in for a water pump replacement on short notice and had me back on the road in a few hours. Very professional staff and a nice clean facility with a comfortable waiting room."

Anthony Cummings

5 star review

"Fast, friendly same day service! Tractor and APU PM, trailer tire change and reefer maintenance in less than 3.5 hours 💪 IG @the_happy_trucker 🚛💨💨"

5 star review

"The best service in Chicago! These guys have real mechanics that know their stuff and they carry a lot of parts for Volvo. Cheap fast, and good service. This is my favorite shop."