Sr Mobile Diesel Mechanic

Job Title

Sr Mobile Diesel Technician – DOT Management Level

Cox Automotive (Cox Fleet)

Perform DOT inspections, preventive maintenance and advanced repairs on light, medium and heavy‑duty trucks and trailers in a mobile/field environment. Act as the lead technician on job sites, providing expert diagnostics, troubleshooting, and client consultation.

• Schedule and conduct preventative maintenance (PM) and DOT inspections for a range of vehicles.
• Perform minor adjustments and repairs on electronic, hydraulic, electrical, and mechanical systems including brakes, cooling, engine electronics, diesel steering, transmissions, clutches, and differentials.
• Diagnose and resolve equipment malfunctions using handheld computers, pressure gauges, and other diagnostic instruments.
• Road‑test vehicles to verify proper operation after repairs.
• Manage parts inventory, obtain necessary parts from approved vendors, and reconcile supplies.
• Maintain company‑issued service vehicle, perform safety checks, and conduct pre‑ and post‑trip inspections.
• Engage with clients and customers to assess needs, provide information, and resolve issues.
• Prioritize concurrent tasks, allocate time efficiently, and maintain high productivity.
• Use hand tools, precision instruments, welding equipment, lifts, and jacks in accordance with safety protocols.
• Document work, upload photos, and fill out DOT and internal forms using the company iOS device and TRAIT application.
• Conform to OSHA, EPA, DOT, and internal safety, health, and environmental policies.

• High school diploma or GED plus at least 3 years of experience with heavy‑duty vehicles.
• Alternate candidates may have a related degree or 5 years of experience.
• Minimum of 3 years’ experience with refrigerated equipment.
• Own a set of hand tools required for job duties.
• Must complete all company‑required training.
• Pass DOT‑regulated pre‑employment background screening and physical exam; a DOT medical card with more than four months validity may substitute the physical.
• Must be 21 years or older, hold a valid driver’s license in the state of residence, and maintain a Driver Qualification File.

• ASE T8 (PMI)
• ASE 608/609
• ASE T2 (Diesel Engines)
• ASE T3 (Drivetrain)
• ASE T4 (Brakes)
• ASE T5 (Suspension)
• ASE T6 (Electrical & Electronic Systems)
• ASE T7 (HVAC)
• ASE A8 (Engine Performance)
• ASE L1 (Advanced Engine Performance Specialist)
• ASE L2 (Electronic Diesel Engine Diagnosis Specialist)

• Strong analytical and problem‑solving abilities.
• Ability to lift, bend, climb, and stand for extended periods; perform moderate heavy labor.
• Excellent written and verbal communication; concise and organized.
• Effective two‑way communication with clients and team members.
• Judicious use of tool and equipment selection.
• Spatial awareness and ability to judge distances.
• Logical reasoning to evaluate alternatives and make informed decisions.

• Health, dental and vision insurance starting Day
  1.
• 401(k) matching after 90 days: 100% match up to 6% plus company discretionary contribution.
• Paid time off: 6.67 hours each month, additional holidays, and leave for bereavement, jury duty, volunteer work, military, parental, and other statutory entitlements.
• Tuition assistance and reimbursement.
• Pet insurance.
• Safety gear reimbursement and provision of safety boots, glasses, and extreme‑weather gear.
• Opportunity to take the service truck home daily.
• Tablet and company cellphone provided for work.
• Comprehensive technical training and career advancement path.

Cox is an Equal Employment Opportunity employer. All qualified applicants will receive consideration for employment without regard to age, race, color, religion or creed, national origin or ancestry, sex, sexual orientation, gender identity, disability, veteran status, genetic information, ethnicity, citizenship, or any other characteristic protected by law. Applicants must be authorized to work in the U.S. without sponsorship.

06/29/2026