Senior Mobile Diesel Technician – On‑Site Lead

Cox Enterprises, Inc.; Plymouth (MA); On-site; USD 45,000 - 67,000; Full time

Benefits offered by this job

Weekly pay

Bonuses for safety/efficiency

Safety gear reimbursement

Uniforms provided

Company tablet and cell phone

Job summary

Cox Fleet is hiring a Mobile Diesel Technician II to perform licensed DOT inspections, PMs, repairs, and diagnostics in a field/mobile setting. You will lead on jobsites, triage complex issues, and act as a consultant for customers while maintaining DOT compliance and safety standards.

The role requires 3+ years in diesel/heavy equipment, ASE certifications preferred, and the ability to manage parts and documentation via TRAIT on an iOS device. Competitive hourly pay and benefits offered.

Qualifications

• High School Diploma or GED; 3 years related field experience or 5 years related field experience.
• At least 3 years of experience with refrigerated equipment.
• Own a set of hand tools necessary to perform required duties.
• OEM training and certifications are preferred.
• Complete all required company training.
• DOT/FMCSA regulations knowledge; able to pass pre-employment checks.
• DOT medical card current or able to obtain.
• Must be 21+ years old and hold a valid state driver’s license.

Responsibilities

• Perform scheduled preventive maintenance (PM) and DOT inspections on light–heavy vehicles in mobile environments.
• Diagnose and repair electrical, braking, cooling, engine electronics, and drive train systems.
• Inspect, test, and diagnose faults using handheld devices and gauges.
• Road test vehicles to verify repairs and functionality.
• Manage parts inventory and stock on the service truck; reconcile periodically.
• Document findings, parts used, and RO details in TRAIT app on an iOS device.
• Complete DOT forms and other required documentation promptly.
• Maintain safety checks on the service vehicle and perform pre-/post-trip inspections.

Skills

Problem solving

Communication

Decision making

Physical stamina

Safety compliance

Teamwork

Education

High School Diploma or GED

Tools

Hand tools

Diesel tools

Welding equipment

iOS TRAIT app

Test instruments

Job description

Cox Fleet is hiring a Mobile Diesel Technician II to perform licensed DOT inspections, PMs, repairs, and diagnostics in a field/mobile setting. You will lead on jobsites, triage complex issues, and act as a consultant for customers while maintaining DOT compliance and safety standards.

The role requires 3+ years in diesel/heavy equipment, ASE certifications preferred, and the ability to manage parts and documentation via TRAIT on an iOS device. Competitive hourly pay and benefits offered.