Heavy-Duty Diesel Technician: Fleet Diagnostics & Repairs

VINNYS TRUCK CENTER; Mapleville (MD); On-site; USD 55,000 - 75,000; Full time

Job summary

Vinny's Truck Center is seeking a Diesel Mechanic to inspect, diagnose, repair, and maintain our customers' medium- and heavy-duty trucks, trailers, and equipment. You will document work clearly and flag issues before breakdowns to keep fleets on the road.

Responsibilities include diagnosing engines, fuel systems, air brakes, and ECMs; performing preventive maintenance; and road-testing vehicles to verify repairs. A valid CDL and state inspections knowledge are a plus.

Qualifications

• High school diploma or GED.
• 2+ years of hands-on diesel repair experience on medium- or heavy-duty trucks.
• Working knowledge of diesel engines, air brakes and 12/24V electrical systems.
• Ability to use diagnostic laptops and software (e.g., Cummins INSITE, Detroit DiagnosticLink, JPRO, Noregon).
• Own basic hand tool set appropriate for heavy-duty repair.
• Valid driver's license with a clean driving record.
• Able to read service manuals, wiring diagrams and schematics.

Responsibilities

• Diagnose and repair diesel engines, fuel systems, turbochargers and aftertreatment (DPF, DEF/SCR, EGR).
• Troubleshoot electrical systems, wiring, sensors and ECMs using OEM and aftermarket diagnostic software.
• Perform preventive maintenance: oil and filter service, fluid checks, lubrication and scheduled inspections.
• Repair and adjust air brake systems, suspensions, steering, drivetrains, transmissions and differentials.
• Service HVAC, cooling and hydraulic systems.
• Complete DOT annual inspections and document defects to FMCSA standards.
• Record labor, parts and findings accurately in the work order or fleet maintenance system.
• Road-test vehicles to verify repairs.
• Respond to roadside or on-site service calls as scheduled.
• Keep tools, bays and equipment clean, organized and safe; follow all shop safety and environmental procedures

Skills

Diesel engine repair

Electrical systems (12/24V)

Air brakes knowledge

Diagnostics and troubleshooting

Road testing & verification

Education

High school diploma or GED

ASE certifications (Medium/Heavy Truck T-series)

ASE Master Truck Technician

Class A CDL

Diesel technology certificate or associate degree

DOT/FMCSA inspector qualification

Tools

Cummins INSITE

Detroit DiagnosticLink

JPRO

Noregon

Job description

Vinny's Truck Center is seeking a Diesel Mechanic to inspect, diagnose, repair, and maintain our customers' medium- and heavy-duty trucks, trailers, and equipment. You will document work clearly and flag issues before breakdowns to keep fleets on the road.

Responsibilities include diagnosing engines, fuel systems, air brakes, and ECMs; performing preventive maintenance; and road-testing vehicles to verify repairs. A valid CDL and state inspections knowledge are a plus.