Master Diagnostic Mechanic

Master Diagnostic Mechanic – Electrical & Diesel Specialist

312 Truck Body Repair & Painting | Chicago, IL

Job Summary

312 Truck is seeking a Master Diagnostic Mechanic with deep expertise in complex electrical diagnostics and diesel systems. This role is for a top-tier technician who can accurately diagnose and repair the difficult problems other shops struggle with—CAN issues, intermittent faults, module communication failures, and advanced drivability concerns. You will serve as a technical leader within the shop, driving efficient, accurate repairs and minimizing downtime for fleet and commercial vehicles.

Key Responsibilities

• Diagnose complex electrical, electronic, and drivability issues across light, medium, and heavy-duty vehicles.
• Troubleshoot CAN networks, wiring faults, parasitic draws, sensor failures, module communication issues, and intermittent electrical problems.
• Perform advanced electrical testing using ohmmeters, multimeters, oscilloscopes, wiring diagrams, and OEM scan tools.
• Diagnose and repair diesel engine systems, including fuel delivery, emissions/aftertreatment, sensors, and control modules.
• Interpret OEM service information, wiring schematics, PID data, and diagnostic flow charts accurately.
• Lead difficult repairs by providing technical guidance to technicians and confirming root-cause repairs—not parts swapping.
• Verify repairs through proper testing, calibrations, resets, and post-repair scans.
• Maintain clear and accurate documentation of diagnostics, findings, repairs, and parts used.
• Assist in mentoring and raising the technical diagnostic standard of the shop.
• Stay current with evolving vehicle technology, OEM updates, and diagnostic best practices.

Qualifications & Requirements

• Proven experience as a Master Diagnostic Mechanic or senior-level technician specializing in electrical diagnostics.
• Strong electrical diagnostic skillset: wiring analysis, voltage drop testing, CAN bus diagnostics, and module troubleshooting.
• Diesel engine repair experience preferred, including diagnostics on modern diesel platforms.
• Proficiency with advanced diagnostic equipment, including multimeters, oscilloscopes, and OEM or professional scan tools.
• Ability to read and interpret wiring diagrams, schematics, and OEM diagnostic procedures.
• ASE Master Technician certification preferred.
• Ford, MOPAR, or other OEM certifications strongly preferred.
• Valid driver’s license and ability to work efficiently in a fast-paced, commercial repair environment.
• Detail-oriented, methodical, and committed to high-quality, accurate repairs.

Why 312 Truck

• We handle high-level electrical and diagnostic work others can’t
• Commercial, fleet, and complex repair focus
• Professional shop environment with serious equipment and support
• Opportunity to be the go-to diagnostic expert, not just another tech
• Competitive pay based on skill and experience

Pay: $32.00 - $55.00 per hour

Benefits:

• Dental insurance
• Health insurance
• Vision insurance

Work Location: In person