Mid LevelDiesel Mechanic Resume Example

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Diesel Mechanic Resume Template (mid level)

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Professional Summary

Journeyman Diesel Mechanic with strong hands-on experience overhauling Cummins and Detroit engines, diagnosing aftertreatment and fuel systems, and maintaining fleet uptime. Known for fast, clean turnaround and low comeback rates.

Professional Experience

Diesel TechnicianAug 2021 - Present

Ironline Truck & Trailer, Dallas, TX

Overhauled Cummins ISX and Detroit DD15 engines to OEM torque specs, completing 8 in-frame rebuilds per quarter with zero warranty comebacks.
Diagnosed engine and aftertreatment faults with JPRO and DiagnosticLink, cutting average diagnostic time to under 45 minutes per unit.
Cleared DPF regens and replaced EGR coolers and SCR doser valves, reducing fleet derate events by 40%.

Diesel MechanicJul 2019 - Jul 2021

Lone Star Freight Lines, Fort Worth, TX

Performed 12 to 15 PM services per week per FMCSA schedules at a 98% on-time completion rate across a 120-truck fleet.
Serviced S-cam air brake systems and completed DOT inspections, maintaining a 96% first-pass rate.
Replaced fuel injectors and high-pressure pumps on PACCAR MX engines, restoring rated power and clearing low-power codes.

Skills

Engine Overhaul, JPRO, Cummins INSITE, Aftertreatment Diagnostics, Fuel Systems, Air Brake Systems, DOT Inspection, Electrical Diagnostics

Education

A.A.S. Diesel TechnologyMay 2019

Tarrant County College

High School DiplomaJun 2016

R.L. Turner High School

Certifications

ASE T2 Diesel Engines
ASE T4 Brakes
ASE T6 Electrical/Electronic Systems
EPA 609 Certification
CDL Class A

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Key Skills for Diesel Mechanic

Engine OverhaulJPROCummins INSITEAftertreatment DiagnosticsFuel SystemsAir Brake SystemsDOT InspectionElectrical Diagnostics

ATS Keywords for Diesel Mechanic

Use these naturally in your summary, skills, and experience when they reflect your background.

Diesel MechanicEngine OverhaulCummins ISXDetroit DD15JPROAftertreatment DPF SCRFuel InjectorsAir Brake SystemsDOT InspectionASE T-serieswarranty claimsfleet uptime

How to Write a Mid Level Diesel Mechanic Resume

A mid-level diesel mechanic resume needs to show independent repair ownership: engine overhauls you completed start to finish on Cummins and Detroit platforms, aftertreatment and fuel-system diagnostics with JPRO and INSITE, and the PM and DOT discipline that kept a fleet running without a senior tech looking over your shoulder.

Resume Writing Tips

Quantify overhauls and comebacks

State the engine platform, the repair, and a quality metric, like 8 Cummins ISX in-frame rebuilds per quarter with zero warranty comebacks. Comeback rate and rebuild volume prove you follow torque specs and OEM procedures under real deadlines.

Show aftertreatment and diagnostic depth

Name the scan tools and the emissions components you repaired, DPF, EGR, SCR doser valves, NOx sensors, and tie them to a derate reduction or diagnostic time. That depth is exactly what separates a journeyman from an oil-change tech.

Prove fleet reliability outcomes

Cite PM on-time completion, DOT first-pass rate, or fleet uptime across a named fleet size. A number like 97% uptime across 85 tractors shows you keep trucks earning, not just fix them when they break.

Skills to Highlight

Engine Overhaul

Describe an in-frame or complete overhaul you owned on a named platform like DD15 or ISX, including torque-spec work, and the comeback-free window that followed to prove quality.

Aftertreatment Diagnostics

Detail a DPF, EGR, or SCR repair you diagnosed with JPRO or DiagnosticLink and the derate or fault-code outcome, showing you handle the emissions work fleets struggle with.

Fuel Systems

Cite injector or high-pressure pump work on a specific engine, the low-power symptom you resolved, and how you verified rated power was restored.

DOT Inspection

Explain your inspection volume and first-pass rate, and note that you documented and corrected out-of-service defects, proving you protect the fleet from violations.

Common Questions

How do I show I'm past entry-level without a lead title?

Emphasize independence and scope: overhauls you completed alone, aftertreatment faults you diagnosed without escalating, and warranty jobs you documented to spec. Owning a repair from teardown to road-test, with a comeback rate to back it, is what separates journeyman work from apprentice tasks.

Which ASE certifications matter most at this stage?

The T-series drives the most value, T2 diesel engines, T4 brakes, and T6 electrical, since they map directly to the work fleets need. Stacking several toward ASE Master Medium/Heavy Truck signals breadth. Keep EPA 609 and a CDL listed too, since they let you handle refrigerant and road-test.

What if I don't have exact numbers for uptime or comebacks?

Mid-level Maintenance Technician resume sample highlighting measurable execution, cross-functional collaboration, and dependable delivery outcomes.

Preventive MaintenanceMechanical RepairElectrical Troubleshooting

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