Mobile Diesel Mechanic

Valorfleetservices; Leesburg (VA); On-site; USD 52,000 - 90,000; Full time

Job summary

Valorfleetservices in Leesburg, VA is seeking an experienced diesel technician for field service and on-site repairs. You will diagnose and repair diesel engines and related systems in the field, run OEM and aftermarket diagnostics, and perform preventive maintenance to ensure reliability and safety.

The role requires 3+ years of hands-on diesel repair, a valid CDL, and proficiency with diagnostic software.

Qualifications

• 3+ years of hands-on diesel repair on Class 6–8 trucks or heavy equipment.
• High school diploma or GED; diesel technology certificate or equivalent training.
• Valid driver's license with clean driving record; pass DOT physical and drug screen.
• Proficient with diagnostic software, multimeters and electrical schematics.
• Own a full set of mechanic's hand tools.
• Able to work independently, prioritize calls and make sound repair decisions without on-site supervision.
• Strong communication skills with customers and dispatch.

Responsibilities

• Diagnose and repair diesel engines, fuel, air-brake, electrical, cooling, drivetrain, suspension and aftertreatment (DPF, DEF/SCR, EGR) systems in the field.
• Run computer diagnostics with OEM and aftermarket software (e.g., Cummins INSITE, Detroit DiagnosticLink, JPRO).
• Perform preventive maintenance: oil and filter service, lubrication, brake adjustments, belts, hoses and fluid checks.
• Complete DOT annual inspections and document findings accurately.
• Respond to roadside and on-site breakdown calls, including after-hours on-call rotation.
• Communicate with customers and dispatch about repair status, findings and recommendations.
• Complete work orders, parts usage and time records accurately and promptly in the shop software.
• Maintain the service truck, tools and parts inventory in clean, safe and road-ready condition.
• Follow all safety procedures, including lockout/tagout, roadside safety and proper handling of hazardous materials.

Skills

Diesel repair

Customer communication

Independent work

Time management

Education

High school diploma or GED

Diesel technology certificate

Tools

Cummins INSITE

Detroit DiagnosticLink

JPRO

Job description

Description

Key responsibilities

• Diagnose and repair diesel engines, fuel, air-brake, electrical, cooling, drivetrain, suspension and aftertreatment (DPF, DEF/SCR, EGR) systems in the field
• Run computer diagnostics with OEM and aftermarket software (e.g., Cummins INSITE, Detroit DiagnosticLink, JPRO)
• Perform preventive maintenance: oil and filter service, lubrication, brake adjustments, belts, hoses and fluid checks
• Complete DOT annual inspections and document findings accurately
• Respond to roadside and on-site breakdown calls, including after-hours on-call rotation
• Communicate with customers and dispatch about repair status, findings and recommendations
• Complete work orders, parts usage and time records accurately and promptly in the shop software
• Maintain the service truck, tools and parts inventory in clean, safe and road-ready condition
• Follow all safety procedures, including lockout/tagout, roadside safety and proper handling of hazardous materials

Requirements

Required qualifications

3+ years of hands-on diesel repair experience on Class 6–8 trucks or heavy equipment

High school diploma or GED; diesel technology certificate or equivalent training

Valid driver's license with a clean driving record; able to pass a DOT physical and drug screen

Proficient with diagnostic software, multimeters and electrical schematics

Own a full set of mechanic's hand tools

Able to work independently, prioritize calls and make sound repair decisions without on-site supervision

Strong communication skills with customers and dispatch

Preferred qualifications

ASE certifications (Medium/Heavy Truck T-series), especially T2 Diesel Engines and T4 Brakes

Class A CDL

Qualified DOT/FMCSA annual inspector; brake inspector qualification

Experience with reefer units, liftgates, hydraulics or welding/fabrication

Prior mobile or roadside service experience

Familiarity with fleet maintenance software